A method, apparatus, device and medium for resonant cavity peak current control of data center power supply

Abstract

This application provides a method, apparatus, device, and medium for controlling the peak current of a resonant cavity in a data center power supply. The method includes: acquiring the output voltage and output current of a three-phase LLC resonant converter; generating a resonant cavity current reference value based on the output voltage, output current, and a preset target voltage; acquiring the actual resonant current of the resonant cavity through a current detection circuit and extracting the active current sampling value; comparing it with the resonant cavity current reference value to generate a target square wave signal; and generating a PWM signal through a state machine based on the relationship between the active current sampling value represented by the target square wave signal and the resonant cavity current reference value to drive the three-phase LLC resonant converter. This application's embodiment solves the problems of slow response speed and difficulty in quickly and accurately controlling the resonant cavity current during large dynamic load switching in traditional frequency modulation control methods.

Description

Technical Field

[0001] This application relates to the field of power electronics technology, and more specifically, to a method, apparatus, device, and medium for controlling the peak current of a resonant cavity in a data center power supply. Background Technology

[0002] Three-phase LLC resonant converters are widely used in high-voltage DC power supply systems for data centers due to their high efficiency, high power density, and soft-switching characteristics. They convert three-phase AC power from the grid into isolated high-voltage DC output to power core loads such as servers, storage devices, and AI computing chips. In actual operation, loads such as AI chips exhibit extremely strong dynamic characteristics, with current change rates reaching thousands of amperes per microsecond. This requires the power supply system to have millisecond-level or even microsecond-level overload response capabilities, such as providing 1.6 times the rated power output within 1 ms to ensure the full utilization of the AI ​​chip's computing power.

[0003] Currently, three-phase LLC resonant converters mainly employ frequency modulation control, adjusting the switching frequency to change the resonant cavity gain and thus stabilize the output voltage. However, research has revealed that the existing frequency modulation control method has a slow response speed, making it difficult to meet the requirements of data center power supply systems for rapid and precise control of the resonant cavity current during large dynamic load switching. Summary of the Invention

[0004] In view of this, embodiments of this application provide a method, apparatus, device and medium for controlling the peak current of a resonant cavity in a data center power supply, in order to solve the problems of slow response speed and difficulty in quickly and accurately controlling the resonant cavity current during large dynamic load switching in traditional frequency modulation control methods.

[0005] In a first aspect, embodiments of this application provide a method for controlling the peak current of a resonant cavity in a data center power supply, the method comprising: The output voltage and output current of the three-phase LLC resonant converter are collected, and a resonant cavity current reference value is generated based on the output voltage, the output current and the preset target voltage. By using a current detection circuit installed in the current path of each phase of the resonant cavity, the actual resonant current of the resonant cavity is collected, and the active current component in the actual resonant current is extracted to obtain the active current sampling value. The active current sampling value of each phase is compared with the resonant cavity current reference value, and the corresponding target square wave signal is generated based on the comparison result. Based on the relationship between the active current sample value represented by the target square wave signal of each phase and the resonant cavity current reference value, a pulse width modulation pulse signal is generated through a preset state machine to drive the power switching transistors in the three-phase LLC resonant converter. The pulse width modulation pulse signal is used to control the three-phase LLC resonant converter to switch between multiple preset driving states cycle by cycle, so as to control the peak current of the resonant cavity within the allowable error range of the resonant cavity current reference value.

[0006] In one feasible implementation, the pulse width modulation pulse signal is used to control the three-phase LLC resonant converter to cycle between multiple preset drive states in a fixed sequence; Each driving state includes a fixed three-phase level combination sequence, and the duration of the last level combination in each driving state is determined by whether at least one of the following two conditions is met: whether the active current sample value reaches the resonant cavity current reference value, or whether the active current sample value exceeds the preset maximum current limit. When any condition is met, the last level combination of the current driving state is terminated and the next driving state is switched, thereby controlling the peak current of the resonant cavity within the allowable error range of the resonant cavity current reference value and limiting it to not exceed the maximum current limit.

[0007] In one feasible implementation, the plurality of preset drive states include six drive states that cycle sequentially. Drive states one, three, and five have a first type of level combination sequence; drive states two, four, and six have a second type of level combination sequence. Each level combination sequence contains three level combinations executed sequentially. The duration of the first two level combinations is determined by a preset dead time and / or a preset minimum on-time, respectively. The duration of the third level combination is determined by any of the following conditions: The active current sampling value reaches the resonant cavity current reference value; The active current sample value exceeds the preset maximum current limit; The duration of the second level combination in the current driving state has reached the preset minimum conduction time; wherein, when any condition is met, the third level combination of the current driving state is terminated and the first level combination of the next driving state is switched to achieve cycle-by-cycle control of the peak current of the resonant cavity.

[0008] In one feasible implementation, the dead time is the shoot-through protection time when two complementary power switches in the same phase switch, and the minimum conduction time is the shortest conduction time to ensure the normal operation of the resonant cavity.

[0009] In one feasible implementation, the active current component in the actual resonant current is extracted, including: The actual resonant current is rectified by a controllable rectifier circuit to remove the reactive current component.

[0010] In one feasible implementation, the method further includes: After the actual resonant current is rectified in a controllable manner, a slope compensation signal is introduced to suppress the subharmonic oscillation of the loop.

[0011] In one feasible implementation, generating the resonant cavity current reference value includes: The difference between the output voltage and the target voltage, and the output current used to characterize load changes, are input to a proportional-integral-derivative (PID) controller, and the output of the PID controller is used as the reference value for the resonant cavity current.

[0012] Secondly, embodiments of this application also provide a resonant cavity peak current control device for data center power supply, the device comprising: The generation module is used to acquire the output voltage and output current of the three-phase LLC resonant converter, and generate a resonant cavity current reference value based on the output voltage, the output current and the preset target voltage. The extraction module is used to collect the actual resonant current of the resonant cavity through the current detection circuit set in the current path of each phase of the resonant cavity, and extract the active current component in the actual resonant current to obtain the active current sampling value. The comparison module is used to compare the active current sampling value of each phase with the resonant cavity current reference value, and generate the corresponding target square wave signal based on the comparison result. The driving module is used to generate pulse width modulation (PWM) pulse signals to drive the power switching transistors in the three-phase LLC resonant converter based on the relationship between the active current sample value represented by the target square wave signal of each phase and the resonant cavity current reference value through a preset state machine. The PWM pulse signals are used to control the three-phase LLC resonant converter to switch between multiple preset driving states cycle by cycle, so as to control the peak current of the resonant cavity within the allowable error range of the resonant cavity current reference value.

[0013] In one feasible implementation, the pulse width modulation pulse signal is used to control the three-phase LLC resonant converter to cycle between multiple preset drive states in a fixed sequence; Each driving state includes a fixed three-phase level combination sequence, and the duration of the last level combination in each driving state is determined by whether at least one of the following two conditions is met: whether the active current sample value reaches the resonant cavity current reference value, or whether the active current sample value exceeds the preset maximum current limit. When any condition is met, the last level combination of the current driving state is terminated and the next driving state is switched, thereby controlling the peak current of the resonant cavity within the allowable error range of the resonant cavity current reference value and limiting it to not exceed the maximum current limit.

[0014] In one feasible implementation, the plurality of preset drive states include six drive states that cycle sequentially. Drive states one, three, and five have a first type of level combination sequence; drive states two, four, and six have a second type of level combination sequence. Each level combination sequence contains three level combinations executed sequentially. The duration of the first two level combinations is determined by a preset dead time and / or a preset minimum on-time, respectively. The duration of the third level combination is determined by any of the following conditions: The active current sampling value reaches the resonant cavity current reference value; The active current sample value exceeds the preset maximum current limit; The duration of the second level combination in the current driving state has reached the preset minimum conduction time; wherein, when any condition is met, the third level combination of the current driving state is terminated and the first level combination of the next driving state is switched to achieve cycle-by-cycle control of the peak current of the resonant cavity.

[0015] In one feasible implementation, the dead time is the shoot-through protection time when two complementary power switches in the same phase switch, and the minimum conduction time is the shortest conduction time to ensure the normal operation of the resonant cavity.

[0016] In one feasible implementation, the extraction module is used to extract the active current component from the actual resonant current, for the following purposes: The actual resonant current is rectified by a controllable rectifier circuit to remove the reactive current component.

[0017] In one feasible implementation, the device further includes: The compensation module is used to introduce a slope compensation signal after the actual resonant current is controlled and rectified, so as to suppress the subharmonic oscillation of the loop.

[0018] In one feasible implementation, the generation module is used to generate a resonant cavity current reference value for: The difference between the output voltage and the target voltage, and the output current used to characterize load changes, are input to a proportional-integral-derivative (PID) controller, and the output of the PID controller is used as the reference value for the resonant cavity current.

[0019] Thirdly, embodiments of this application also provide an electronic device, including: a processor, a storage medium, and a bus, wherein the storage medium stores machine-readable instructions executable by the processor, and when the electronic device is running, the processor communicates with the storage medium via the bus, and the processor executes the machine-readable instructions to perform the steps of the resonant cavity peak current control method for data center power supply as described in any of the first aspects.

[0020] Fourthly, embodiments of this application also provide a computer-readable storage medium storing a computer program, which, when executed by a processor, performs the steps of the resonant cavity peak current control method for data center power supply as described in any of the first aspects.

[0021] This application provides a method, apparatus, device, and medium for controlling the peak current of a resonant cavity in a data center power supply system. The method involves acquiring the output voltage and current of a three-phase LLC resonant converter and generating a resonant cavity current reference value based on a preset target voltage. Simultaneously, a current detection circuit in each phase's resonant cavity current path acquires the actual resonant current and extracts its active current component, obtaining active current sampling values ​​for each phase. These active current sampling values ​​are then compared with the resonant cavity current reference value to generate corresponding target square wave signals. Finally, based on the current magnitude relationship represented by the target square wave signals, a preset state machine generates pulse width modulation (PWM) pulse signals to drive the power switching transistors, controlling the converter to switch between multiple preset drive states cycle by cycle, thereby precisely controlling the peak current of the resonant cavity within the allowable error range of the resonant cavity current reference value.

[0022] Compared with the existing technology that relies on frequency modulation control, has a slow response speed, and is difficult to limit the resonant cavity current quickly and accurately, the embodiments of this application introduce active current extraction, phase-by-phase comparison and state machine dynamic switching mechanism to achieve fast response and cycle-by-cycle precise control of the resonant cavity current, which can effectively solve the problems of resonant cavity overcurrent and control response lag when switching large dynamic loads.

[0023] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 A flowchart of a resonant cavity peak current control method for data center power supply provided in an embodiment of this application is shown.

[0026] Figure 2 The diagram shows a main circuit topology of a three-phase LLC resonant converter provided in an embodiment of this application.

[0027] Figure 3 A circuit diagram of a resonant cavity current detection circuit provided in an embodiment of this application is shown.

[0028] Figure 4 This illustration shows a principle block diagram of generating a target square wave signal according to an embodiment of this application.

[0029] Figure 5 A flowchart illustrating a drive state switching method provided in an embodiment of this application is shown.

[0030] Figure 6 A schematic diagram of the structure of a resonant cavity peak current control device for data center power supply provided in an embodiment of this application is shown.

[0031] Figure 7 A schematic diagram of the structure of an electronic device provided in an embodiment of this application is shown. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0033] Three-phase LLC resonant converters are widely used in high-voltage DC power supply systems for data centers due to their high efficiency, high power density, and soft-switching characteristics. They convert three-phase AC power from the grid into isolated high-voltage DC output to power core loads such as servers, storage devices, and AI computing chips. In actual operation, loads such as AI chips exhibit extremely strong dynamic characteristics, with current change rates reaching thousands of amperes per microsecond. This requires the power supply system to have millisecond-level or even microsecond-level overload response capabilities, such as providing 1.6 times the rated power output within 1 ms to ensure the full utilization of the AI ​​chip's computing power.

[0034] Currently, three-phase LLC resonant converters mainly employ frequency modulation control, adjusting the switching frequency to change the resonant cavity gain and thus stabilize the output voltage. However, research has revealed that the existing frequency modulation control method has a slow response speed, making it difficult to meet the requirements of data center power supply systems for rapid and precise control of the resonant cavity current during large dynamic load switching.

[0035] Based on this, embodiments of this application provide a method, apparatus, device, and medium for controlling the peak current of a resonant cavity in a data center power supply, which will be described below through embodiments.

[0036] To facilitate understanding of this embodiment, a method for controlling the peak current of a resonant cavity in a data center power supply, as disclosed in this application embodiment, will first be described in detail. For example... Figure 1 As shown, it includes the following steps: Step 101: Collect the output voltage and output current of the three-phase LLC resonant converter, and generate a resonant cavity current reference value based on the output voltage, the output current and the preset target voltage.

[0037] In step 101, the current operating status of the three-phase LLC resonant converter needs to be obtained, specifically including acquiring its output voltage and output current. The output voltage reflects the voltage level currently supplied by the converter to the load, while the output current reflects the current demand of the load. These two parameters are the basis for determining whether the system is operating stably.

[0038] Next, the collected output voltage and current are processed in conjunction with a preset target voltage—the value we want the output voltage to stabilize at—to generate a resonant cavity current reference value. This reference value can be understood as the target current that should flow through the resonant cavity to keep the output voltage stable near the target value. The introduction of the output current is mainly to reflect changes in the load, enabling the generated current reference value to respond more quickly to load fluctuations, thereby improving the system's dynamic response capability.

[0039] In practical circuits, output voltage and current can be acquired using conventional voltage and current sensors. The acquired signals, after conditioning, are sent to a controller (such as a digital signal processor or microcontroller) for processing. There are various methods for calculating the resonant cavity current reference value, such as using a proportional-integral-derivative (PID) controller to calculate the voltage error and combining it with the output current for feedforward compensation, or other control algorithms that integrate voltage error and load information. The resonant cavity current reference value mentioned here is an intermediate variable used for subsequent comparison and control; its introduction transforms the output voltage control problem into a resonant cavity current control problem.

[0040] Step 102: By using a current detection circuit installed in the current path of each phase of the resonant cavity, the actual resonant current of the resonant cavity is collected respectively, and the active current component in the actual resonant current is extracted to obtain the active current sampling value.

[0041] In a three-phase LLC resonant converter, each phase is equipped with an independent current detection circuit. These circuits are located on the current path of each phase resonant cavity and are used to collect the actual resonant current of that phase.

[0042] This combination Figure 2 Please provide an explanation, such as Figure 2 As shown, this circuit is a three-phase resonant cavity (LLC) converter for 800V high-voltage direct current (HVDC) power supply scenarios in data centers. It employs a peak current control method to improve dynamic response and current sharing performance. Its primary side is a three-phase bridge inverter structure, responsible for inverting the input DC power into a high-frequency AC square wave; the secondary side uses a six-diode three-phase full-bridge rectifier circuit to rectify the high-frequency AC power into a stable 800V (or fluctuating around 800V) DC output. This symmetrical structure of a primary-side three-phase bridge and a secondary-side full-bridge rectifier is very suitable for high-power, high-efficiency HVDC power supply scenarios in data centers.

[0043] The input of the three-phase LLC resonant converter is on the left, and the output is on the right. The output voltage and output current acquired in step 101 are obtained through... Figure 2 The voltage and current sampling points at the output terminal on the right side of the image are obtained.

[0044] Figure 1 The resonant cavity current detection circuits 201, 202, and 203 are respectively installed on the current path of the three-phase resonant cavity, corresponding to phase A, phase B, and phase C. The circuit structures of these three detection circuits are exactly the same, only their installation positions are different, and they are used to collect the actual resonant current of their respective phases.

[0045] The actual resonant current referred to here is the alternating current flowing through the resonant inductor and resonant capacitor, which includes the active component used for energy transfer and the reactive component that does not participate in energy transfer. For each phase, the alternating current signal flowing through the resonant cavity of that phase can be collected through the resonant cavity current detection circuit.

[0046] Because the resonant cavity current waveform is complex, the directly acquired current signal cannot be used directly for peak current control. Therefore, it is necessary to extract the active current component from the actual resonant current. That is, the acquired resonant current is processed through a controllable rectification stage in the current detection circuit to remove the reactive component and retain only the active component related to energy transfer. In addition, to suppress potential subharmonic oscillations in the control loop, a slope compensation signal can be introduced into the detection circuit to ensure the stability of the control system.

[0047] After the above processing, the corresponding active current sampling values ​​are finally obtained. These sampling values ​​accurately reflect the current used for energy transfer in the resonant cavity of that phase and can be used as the basis for subsequent comparison control. Obtaining the active current sampling values ​​is the foundation of the entire peak current control. Only by accurately extracting the active component can effective control of the resonant cavity current be achieved.

[0048] In one feasible implementation, the active current component in the actual resonant current is extracted, including: The actual resonant current is rectified by a controllable rectifier circuit to remove the reactive current component.

[0049] In other words, the active current component in the actual resonant current can be extracted by using a controllable rectifier circuit to rectify the acquired resonant current. Since the resonant cavity current contains a reactive component, this part of the current does not participate in energy transfer, and directly using it for control would lead to control deviations. Through a controllable rectifier circuit, the active component of the current waveform can be selectively retained while the reactive component is removed, thus obtaining a current signal that truly reflects the energy transfer situation.

[0050] In another embodiment, the method further includes: After the actual resonant current is rectified in a controllable manner, a slope compensation signal is introduced to suppress the subharmonic oscillation of the loop.

[0051] To further improve the stability of the control system, a slope compensation signal can be introduced before or after the controllable rectification of the resonant current. Slope compensation is a commonly used method to suppress subharmonic oscillations. By superimposing a slope waveform on the current detection signal, or by adjusting the reference level of the comparator, it can effectively avoid control loop instability under specific operating conditions and ensure reliable operation of the system over a wide load range.

[0052] In practical circuits, the two schemes described above can be used in combination. The detection circuit typically includes a current sensor, a controllable rectifier, and an optional slope compensation circuit. The current sensor collects the alternating current signal from the resonant cavity; the controllable rectifier processes the collected signal to extract the active component; and the slope compensation circuit introduces a compensation signal when necessary to suppress potential subharmonic oscillations. Through the coordinated operation of these three parts, an accurate and stable active current sample value is ultimately output, providing reliable feedback information for subsequent peak current control.

[0053] This can be combined Figure 3 To understand, such as Figure 3 As shown, the resonant cavity current detection circuit includes a current sensor, a controllable rectification stage, a filtering stage, and a slope compensation circuit.

[0054] A current sensor is used to acquire the actual alternating current signal in the phase resonant cavity. The acquired signal enters a controllable rectification stage, where the reactive current component is removed, retaining only the active current component related to energy transfer. After smoothing by a filtering stage, the active current sample value that can be used for peak control is obtained.

[0055] The controllable rectifier stage has two input interfaces (interface 301 and interface 302): used to control the rectification to determine the direction of active current and eliminate reverse current.

[0056] Below the slope compensation circuit is an input interface (interface 303) for receiving compensation control signals. The slope compensation signal can be injected into the current detection path after controlled rectification to suppress potential subharmonic oscillations in the loop.

[0057] The active current sample value, after being processed by the filtering stage, is finally sent out through two output ports: one output is output through a diode (port 310), which is connected in parallel with the outputs of the other two current sampling circuits (port 310) and sent to 417 for comparison with the preset maximum current limit to realize the current limiting function; the other output is sent to the output terminal (port 311) through the slope compensation circuit, which is used to compare with the resonant cavity current reference value to generate the target square wave signal and realize the loop control function.

[0058] Step 103: Compare the active current sampling value of each phase with the resonant cavity current reference value, and generate the corresponding target square wave signal based on the comparison result.

[0059] In this step, the active current sampling value obtained in the previous step needs to be used and compared with the resonant cavity current reference value to generate the target square wave signal for subsequent control.

[0060] The active current sample value for each phase is fed into a comparator and compared with the resonant cavity current reference value for that phase. The comparator output is a binary signal: when the active current sample value is lower than the resonant cavity current reference value, the comparator outputs one level state; when the active current sample value reaches or exceeds the resonant cavity current reference value, the comparator outputs another level state. This binary signal is the target square wave signal.

[0061] Since the three phases are acquired and compared independently, each phase generates its own corresponding target square wave signal. These square wave signals reflect the relationship between the actual current and the target current in the resonant cavity of that phase in real time, and serve as the direct basis for the subsequent state machine to drive state switching.

[0062] The comparator can be an analog comparator or a software-implemented comparison function in a digital controller. The comparison result is essentially a logic level toggle; this toggle signal, used as the target square wave signal, can then drive subsequent state machine logic. The entire comparison process is performed cycle-by-cycle; within each switching cycle, the comparison result is updated based on the real-time current, thereby achieving real-time tracking and control of the resonant cavity current.

[0063] Step 104: Based on the relationship between the active current sampling value represented by the target square wave signal of each phase and the resonant cavity current reference value, a pulse width modulation pulse signal is generated through a preset state machine to drive the power switching transistors in the three-phase LLC resonant converter; the pulse width modulation pulse signal is used to control the three-phase LLC resonant converter to switch between multiple preset driving states cycle by cycle, so as to control the peak current of the resonant cavity within the allowable error range of the resonant cavity current reference value.

[0064] Step 104 is the execution stage of the entire peak current control method, which is responsible for converting the target square wave signal generated in the previous step into the actual power switch drive signal.

[0065] First, the target square wave signal for each phase is fed into a preset state machine. The target square wave signal represents the relationship between the sampled active current value and the reference value of the resonant cavity current for that phase—when the sampled active current value is lower than the reference value, the square wave is in one level state; when the sampled active current value reaches or exceeds the reference value, the square wave flips to another level state. The state machine monitors the level changes of these square wave signals to determine the current state of the resonant cavity current for each phase in real time.

[0066] The state machine internally presets multiple drive states, which cycle in a fixed order. Each drive state corresponds to a specific combination of power switch transistors. Based on the current magnitude reflected by the target square wave signal, the state machine determines when to switch from one drive state to the next. For example, when the active current sampling value of a certain phase reaches a reference value, the state machine triggers a switch, terminating the current drive state and entering the first stage of the next drive state.

[0067] During the state machine's switching of drive states, corresponding pulse width modulation (PWM) signals are generated synchronously. These signals are sent to the control terminals of each power switch in the three-phase LLC resonant converter, driving the switches to turn on and off according to a predetermined timing sequence. Through this cycle-by-cycle state switching, the converter's operating mode is dynamically adjusted, ensuring that the actual current in the resonant cavity is always controlled within the allowable error range of the resonant cavity current reference value. When the current rises to the reference value, the state is switched in time to limit the current from rising further; when the current drops, the state is switched again to allow the current to rise again. This process is repeated to achieve precise cycle-by-cycle control of the resonant cavity peak current.

[0068] This combination Figure 4 To understand, such as Figure 4 As shown in the figure, this is a block diagram of the principle used to generate the target square wave signal in a three-phase LLC resonant converter. Figure 4 Each label in the table represents the input or output signal of the corresponding module, and the following descriptions are based on the signal flow direction.

[0069] Path 1: Current feedforward processing path.

[0070] 401 and 402 are output current sampling signals. Their AC and DC components are obtained through the AC component extraction module and the filtering module. After passing through the set virtual impedance, they are converted into voltage signal 406. Together with 407 / 408, they generate the given signal of output voltage, so that the output voltage has a monotonically linear characteristic with the output current to facilitate current sharing among multiple modules.

[0071] Path 2: Flow equalization control path.

[0072] 403 is the output current sampling signal, and 405 is the system average current sampling signal. The difference between these two signals is fed into the current sharing PI module, which is a current sharing proportional-integral controller. It is used for current balancing control when multiple machines are connected in parallel, and outputs signal 407 after processing.

[0073] Path 3: Output voltage processing path.

[0074] 404 is the output voltage setting signal, which is sent to the soft-start module to obtain the 408 signal. This signal changes linearly and monotonically from the current output voltage to the value set by 404.

[0075] At this point, we have obtained three intermediate signals: 406, 407, and 408. These three signals are added together to obtain the actual reference value signal 409 for the output voltage. Signal 410 is the output voltage sample value. The difference between the sample value and 409 is used to generate the output voltage error value (signal 411), which is then fed into the PID module.

[0076] The 411 signal is sent to the PID controller, i.e., the proportional-integral-derivative controller. After performing proportional, integral, and derivative operations on the input signal, the PID controller outputs the 412 signal, i.e., the resonant cavity current reference value, which is sent to subsystem one.

[0077] At the same time, the system also generates another important signal 413, which comes from the system's preset maximum current limit, which is the maximum current of the resonant cavity when the system is operating with current limiting.

[0078] Path 4: Subsystem 1 processing path.

[0079] Subsystem 1 receives signal 412 from the PID controller, and also receives three input signals 414, 415, and 416 (this signal originates from signal 311 output by the resonant cavity current sampling module). Subsystem 1 contains a comparator circuit that compares and processes these signals with signal 412 to generate the corresponding target square wave signal.

[0080] Path 5: Subsystem 2 processing path.

[0081] Subsystem 2 receives signal 413 (system maximum current limit) and also receives one input signal 417 (active current sample value). Subsystem 2 contains a comparator and protection circuitry, which compares and processes signal 417 and signal 413 to generate a trigger signal for current limiting.

[0082] Final output path: The output signals of both subsystems are fed into the decoupling module. The decoupling module combines the received target square wave signal and the current-limiting trigger signal with its internally preset state machine logic. Following a fixed sequence of drive state cycles, the decoupling module decouples the input signal into nine PWM drive signals, namely 421-429. Among them, 421 / 422 / 424 / 425 / 427 / 428 correspond to the primary-side power switch drivers of the three-phase LLC, used to directly control the on / off state of the switches in the converter. They also serve as control signals (301 / 302) for the controlled rectification of the corresponding current sampling. 423 / 426 / 429 are slope compensation control signals (303). The function of the entire control loop can be summarized as follows: after processing, comparing and calculating multiple feedback signals such as output voltage and output current, the loop generates PWM drive pulses to control the power switching transistors. By precisely controlling the peak current of the resonant cavity cycle by cycle, the loop achieves output voltage control.

[0083] Specifically, this control loop performs the following functions: First, voltage outer loop control. Using a 404 input signal and a soft-start module, combined with a subsequent PID controller, the output voltage deviation is converted into a resonant cavity current reference value. This reference value represents the target current that should flow through the resonant cavity to maintain stable output voltage. The 412 signal output by the PID controller serves as the benchmark for subsequent comparisons.

[0084] Second, current feedforward and current sharing control. Input signals 401 and 402, after AC component extraction, filtering, and virtual impedance processing, yield signal 406, reflecting dynamic load changes. Input signals 403 and 405, after comparator and current sharing PI processing, yield signal 407, used for multiphase current balancing. These two signals, along with signal 408 output from the soft start, participate in subsequent comparison calculations, providing the system with feedforward information on load changes and current sharing adjustment amounts.

[0085] Third, multi-level comparison and protection. Signals 406, 407, and 408 are processed by the first-stage comparator to obtain signal 409; signals 409 and 410 are then processed by the second-stage comparator to obtain signal 411. This multi-stage comparison structure enables comprehensive judgment of multiple feedback signals. Subsystem 1 receives signal 412 and three external inputs 414, 415, and 416 to generate the target square wave signal; subsystem 2 receives signal 413 and external input 417 to generate the trigger signal for current limiting. This division of labor allows normal peak current control and current limiting functions to work independently yet collaboratively.

[0086] Fourth, state machine decoupling and PWM generation. The decoupling module is the core of the entire circuit. It receives the target square wave signal and the trigger signal for current limiting from the two subsystems, and combines these logic signals with the internally preset state machine. The state machine cycles through drive states in a fixed sequence, determining when to switch from one drive state to the next based on the current magnitude reflected by the target square wave signal. The decoupling module decouples the output of the state machine into nine PWM drive signals 421 to 429, which control the on and off states of each power switch in the three-phase LLC resonant converter.

[0087] Ultimately, the control logic implemented by this circuit is as follows: when the resonant cavity current is lower than the target value, maintain or switch to the current-generating drive state to allow the current to continue rising; when the current reaches or exceeds the target value, or an overcurrent occurs, promptly switch to the non-current-generating drive state to limit the current from rising further. Through this cycle-by-cycle state switching, the peak current of the resonant cavity is precisely controlled within the allowable error range of the target value, while ensuring that it does not exceed the maximum current limit.

[0088] This application provides a method, apparatus, device, and medium for controlling the peak current of a resonant cavity in a data center power supply system. The method involves acquiring the output voltage and current of a three-phase LLC resonant converter and generating a resonant cavity current reference value based on a preset target voltage. Simultaneously, a current detection circuit in each phase's resonant cavity current path acquires the actual resonant current and extracts its active current component, obtaining active current sampling values ​​for each phase. These active current sampling values ​​are then compared with the resonant cavity current reference value to generate corresponding target square wave signals. Finally, based on the current magnitude relationship represented by the target square wave signals, a preset state machine generates pulse width modulation (PWM) pulse signals to drive the power switching transistors, controlling the converter to switch between multiple preset drive states cycle by cycle, thereby precisely controlling the peak current of the resonant cavity within the allowable error range of the resonant cavity current reference value.

[0089] Compared with the existing technology that relies on frequency modulation control, has a slow response speed, and is difficult to limit the resonant cavity current quickly and accurately, the embodiments of this application introduce active current extraction, phase-by-phase comparison and state machine dynamic switching mechanism to achieve fast response and cycle-by-cycle precise control of the resonant cavity current, which can effectively solve the problems of resonant cavity overcurrent and control response lag when switching large dynamic loads.

[0090] In one feasible implementation, the pulse width modulation pulse signal is used to control the three-phase LLC resonant converter to cycle between multiple preset drive states in a fixed sequence.

[0091] Each drive state includes a fixed three-phase level combination sequence, and the duration of the last level combination in each drive state is determined by whether at least one of the following two conditions is met: whether the active current sample value reaches the resonant cavity current reference value, or whether the active current sample value exceeds a preset maximum current limit.

[0092] When any condition is met, the last level combination of the current driving state is terminated and the next driving state is switched, thereby controlling the peak current of the resonant cavity within the allowable error range of the resonant cavity current reference value and limiting it to not exceed the maximum current limit.

[0093] In one feasible implementation, the pulse width modulation (PWM) pulse signal controls the three-phase LLC resonant converter to cycle through multiple preset drive states in a fixed sequence. Here, a drive state refers to a specific combination of conduction states of the power switches in the converter, with each drive state corresponding to a power transfer mode. These drive states are executed cyclically in a pre-set fixed sequence, forming a complete switching cycle.

[0094] Each drive state contains a fixed sequence of three-phase power level combinations. This sequence consists of multiple sequentially executed power level combinations, each corresponding to the specific conduction state of the 1st, 2nd, and 3rd phase power switches. During the execution of the drive state, the duration of the first few power level combinations is usually fixed, determined by the basic operating conditions of the circuit, such as the dead time to ensure safe switching of the switches, or the minimum conduction time to ensure normal operation of the resonant cavity.

[0095] The duration of the last level combination in each drive state is not fixed, but determined by comparing the real-time detected active current sample value with two thresholds: a resonant cavity current reference value for normal control and a maximum current limit for safety protection. The control logic continuously monitors the active current sample value. When it reaches the resonant cavity current reference value, it indicates that the resonant cavity current has reached the target value required by the current load, and the current drive state should be terminated to prevent the current from continuing to rise. When the active current sample value exceeds the maximum current limit, it indicates that an overcurrent condition has occurred, and the current drive state must be terminated immediately to protect the circuit safety.

[0096] Regardless of which of the two conditions mentioned above is met first, the last level combination of the current drive state will be immediately terminated, and the system will switch to the next drive state in a fixed sequence. This switching mechanism enables cycle-by-cycle control of the resonant cavity current: in each drive state, the current rise process is monitored in real time, and once the target value or limit is reached, it is terminated in time, and the current begins to decrease or enters the next energy transfer stage; in the next drive state, the current rises again and is monitored and terminated again. This cycle repeats continuously, ensuring that the peak value of the resonant cavity current is precisely controlled within the allowable error range of the resonant cavity current reference value, while ensuring that it will not exceed the preset maximum current limit under any circumstances. This satisfies the load's requirement for rapid dynamic response while ensuring the safe operation of the converter.

[0097] In one feasible implementation, the plurality of preset driving states include six driving states that cycle sequentially. Driving states one, three, and five have a first type of level combination sequence; driving states two, four, and six have a second type of level combination sequence.

[0098] Each level combination sequence contains three level combinations executed sequentially. The duration of the first two level combinations is determined by a preset dead time and / or a preset minimum on-time, respectively. The duration of the third level combination is determined by any of the following conditions: The active current sampling value reaches the resonant cavity current reference value; the active current sampling value exceeds the preset maximum current limit; the duration of the second level combination in the current driving state has reached the preset minimum conduction time; wherein, when any of the conditions are met, the third level combination of the current driving state is terminated and the first level combination of the next driving state is switched to achieve cycle-by-cycle control of the resonant cavity peak current.

[0099] In one feasible implementation, the preset drive states specifically include six sequentially cycling drive states, executed repeatedly in the order of drive state one, two, three, four, five, and six. These six drive states are not independent but are divided into two types: drive states one, three, and five belong to the same type, having a first-type level combination sequence; drive states two, four, and six belong to the other type, having a second-type level combination sequence. This alternating setting aims to achieve three-phase balance and avoid current imbalance caused by deviations in phase parameters.

[0100] Each type of level combination sequence contains three level combinations executed sequentially. Taking the first type of level combination sequence as an example, it consists of three specific three-phase level combinations in a fixed order; the second type of level combination sequence also consists of three specific three-phase level combinations in a fixed order, but it differs from the first type. Each level combination corresponds to a specific set of conduction states of the 1, 2, and 3-phase power switching transistors, which together determine the direction and magnitude of the current flow in the resonant cavity.

[0101] During the execution of each drive state, the duration control method for the three level combinations differs. The durations of the first two level combinations are fixed: the duration of the first level combination is determined by a preset dead time, which is a safety interval set to ensure that shoot-through does not occur when the two switches on the same phase are switching; the duration of the second level combination is determined by a preset minimum on-time, which is the shortest time required for the resonant cavity to establish current normally. These two fixed times ensure the safe switching of the switches and the basic operating conditions of the resonant cavity.

[0102] The duration of the third level combination is dynamically variable and determined by three conditions: the first condition is that the active current sampling value reaches the resonant cavity current reference value, indicating that the resonant cavity current has reached the target value required by the current load; the second condition is that the active current sampling value exceeds the preset maximum current limit, indicating that it is in an overcurrent state and needs immediate protection; the third condition is that the duration of the second level combination in the current drive state has reached the preset minimum conduction time, which is a backup condition to ensure that even if the current does not reach the target value or limit, the drive state will not remain in the third level combination indefinitely.

[0103] When any one of the above three conditions is met first, the third level combination of the current driving state will be terminated immediately, and the system will switch to the first level combination of the next driving state to begin a new round of driving state execution. For example, when the active current sampling value reaches the resonant cavity current reference value during the execution of the third level combination in driving state one, the third level combination of driving state one will be terminated, and the system will switch to the first level combination of driving state two to begin execution.

[0104] This control mechanism achieves precise cycle-by-cycle control of the resonant cavity peak current: in each driving state, the duration of the third level combination is dynamically determined by comparing the real-time current with the target value and the limit value. Switching occurs promptly when the current reaches the target value or is limited, ensuring that the peak value of the resonant cavity current is controlled near the target value. The six driving states cycle repeatedly, with the duration of the third level combination in each state adjusted independently according to the current situation, thus achieving fine-grained control of the three-phase resonant cavity current. This ensures both rapid dynamic response and effective current limiting.

[0105] The following combination Figure 5 Please provide an explanation, such as Figure 5 As shown in the figure, this is a table showing the correspondence between the six drive states and the PWM signals of each phase. The horizontal axis lists the six drive states from 0 to 5 from left to right, and the vertical axis lists the PWM control signals for phases 1, 2, and 3. Each phase contains three signals: signal A, signal B, and signal E. These are denoted as PWM1A, PWM1B, and PWM1E corresponding to phase 1; PWM2A, PWM2B, and PWM2E corresponding to phase 2; and PWM3A, PWM3B, and PWM3E corresponding to phase 3. Numbers 501 to 518 represent the specific state identifiers or timing parameters for each signal under different states.

[0106] from Figure 5 As can be seen, the six driving states cycle sequentially in the order of state 0, 1, 2, 3, 4, and 5. In each driving state, the A-channel signal, B-channel signal, and E-channel signal of each phase are configured according to a preset level combination, which together determine the on and off states of each power switch.

[0107] In each driving state, the waveforms of these PWM signals are executed according to a fixed sequence of level combinations. These level combinations constitute two types of modes: states 0, 2, and 4 have the same type of first-class level combination sequence (LLH—HLH—HLL), while states 1, 3, and 5 have the same type of second-class level combination sequence (LLH—LHH—LHL). This alternation is to achieve multiphase balance and avoid current imbalance caused by deviations in phase parameters.

[0108] Each drive state contains three sequentially executed level combinations. The durations of the first two level combinations (LLH-HLH in the first type of level combination sequence, or LLH-LHH in the second type of level combination sequence) are fixed: the duration of the first level combination (LLH) is determined by a preset dead time, which is a safety interval set to ensure that shoot-through does not occur when the two switches A and B in the same phase are switching; the duration of the second level combination (HLH or LHH) is determined by a preset minimum on-time, which is the shortest time required for the resonant cavity to establish current normally. These two fixed times ensure the safe switching of the switches and the basic operating conditions of the resonant cavity.

[0109] The duration of the third level combination (HLL or LHL) is dynamically variable and determined by three conditions: The first condition is that the active current sampling value reaches the resonant cavity current reference value, which indicates that the resonant cavity current has reached the target value required by the current load.

[0110] The second condition is that the active current sampling value reaches the preset maximum current limit, which indicates that it is in an overcurrent state and needs to be protected immediately.

[0111] The third condition is that the duration of the second level combination in the current drive state has reached the preset minimum on-time. This is a backup condition to ensure that the drive state will not remain indefinitely at the third level combination even if the current does not reach the target value or limit.

[0112] When any one of the above three conditions is met first, the third level combination of the current driving state will be terminated, and then proceed according to... Figure 5 The sequence shown switches to the first level combination of the next driving state. For example, when the active current sampling value reaches the resonant cavity current reference value during the execution of the third level combination in state 0, the third level combination of state 0 will be terminated, and the execution will switch to the first level combination of state 1. The process continues from state 1 to state 2, from state 2 to state 3, and so on, until state 5 is completed and then the process switches back to state 0, forming a continuous cycle.

[0113] In summary, Figure 5 The relationship with peak current control can be summarized as follows: Figure 5It provides the "skeleton" for the driving state cycle—a fixed order of six states and the basic configuration of the PWM signal in each state; while the real-time current comparison result serves as "dynamic filling," determining how long the third level combination in each state remains. When the active current sample value reaches the target value or limit, a state switch is immediately triggered, terminating the current current rise process. In this way, the PWM signal (target square wave signal) follows... Figure 5 The fixed sequence output drives the switching transistor to switch cycle by cycle, applying the three-phase input voltage to the resonant cavity in a predetermined sequence, thereby precisely controlling the peak current of the resonant cavity to be near the target value, while ensuring that it does not exceed the maximum current limit.

[0114] In an optional implementation, generating the resonant cavity current reference value includes: The difference between the output voltage and the target voltage, and the output current used to characterize load changes, are input to a proportional-integral-derivative (PID) controller, and the output of the PID controller is used as the reference value for the resonant cavity current.

[0115] In other words, the resonant cavity current reference value is generated as follows: the difference between the output voltage and the target voltage, as well as the output current used to characterize load changes, are input together into the proportional-integral-derivative (PID) controller, and the output of the PID controller is used as the resonant cavity current reference value.

[0116] It's important to note that the difference between the output voltage and the target voltage reflects the degree to which the current output voltage deviates from the desired value, and is the fundamental error signal for voltage closed-loop control. When the output voltage is lower than the target voltage, it indicates that more energy output is needed to boost the voltage; when the output voltage is higher than the target voltage, it indicates that less energy output is needed. This error signal is the basic input of the proportional-integral-derivative (PID) controller.

[0117] Meanwhile, the output current is also introduced into the proportional-integral-derivative (PID) controller. The magnitude of the output current directly reflects the load intensity: the heavier the load, the larger the output current; the lighter the load, the smaller the output current. More importantly, the rate of change of the output current reflects the dynamic fluctuations of the load. Introducing the output current into the controller is equivalent to adding a feedforward channel to the control system, enabling the controller to detect load changes in advance, without having to wait until the output voltage has deviated before making adjustments.

[0118] After receiving the two input signals, the proportional-integral-derivative (PID) controller performs proportional, integral, and derivative operations on them. The proportional part responds instantly to the current voltage error; the integral part compensates for the historical accumulation of voltage error, eliminating steady-state error; and the derivative part predicts the trend of voltage error changes, while also combining the load change information represented by the output current to further improve the dynamic response capability of the system. Through the combined effect of these three operations, the controller outputs a resonant cavity current reference value.

[0119] This resonant cavity current reference value is actually a control command that integrates voltage error and load information. It represents the target current that should flow through the resonant cavity to maintain the output voltage stable at the current target value. When the load suddenly increases, the increase in output current will cause the controller to adjust the resonant cavity current reference value in advance, preparing the resonant cavity to output more energy. When the output voltage deviates, the voltage error signal will cause the controller to further correct the current reference value until the voltage returns to stability.

[0120] The resonant cavity current reference value generated in this way includes both the regulation effect of the voltage closed loop and the prediction information of load changes, enabling the subsequent inner current loop to respond to load fluctuations more quickly, thereby improving the dynamic response performance of the entire converter.

[0121] Based on the same technical concept, embodiments of this application also provide a resonant cavity peak current control device for data center power supply, such as... Figure 6 As shown, the device includes: The generation module 601 is used to acquire the output voltage and output current of the three-phase LLC resonant converter, and generate a resonant cavity current reference value based on the output voltage, the output current and the preset target voltage.

[0122] The extraction module 602 is used to collect the actual resonant current of the resonant cavity through the current detection circuit set in the current path of each phase of the resonant cavity, and extract the active current component in the actual resonant current to obtain the active current sampling value.

[0123] The comparison module 603 is used to compare the active current sampling value of each phase with the resonant cavity current reference value, and generate the corresponding target square wave signal based on the comparison result.

[0124] The driving module 604 is used to generate pulse width modulation (PWM) pulse signals to drive the power switching transistors in the three-phase LLC resonant converter based on the relationship between the active current sample value represented by the target square wave signal of each phase and the resonant cavity current reference value through a preset state machine. The PWM pulse signals are used to control the three-phase LLC resonant converter to switch between multiple preset driving states cycle by cycle, so as to control the peak current of the resonant cavity within the allowable error range of the resonant cavity current reference value.

[0125] In one feasible implementation, the pulse width modulation pulse signal is used to control the three-phase LLC resonant converter to cycle between multiple preset drive states in a fixed sequence.

[0126] Each drive state includes a fixed three-phase level combination sequence, and the duration of the last level combination in each drive state is determined by whether at least one of the following two conditions is met: whether the active current sample value reaches the resonant cavity current reference value, or whether the active current sample value exceeds a preset maximum current limit.

[0127] When any condition is met, the last level combination of the current driving state is terminated and the next driving state is switched, thereby controlling the peak current of the resonant cavity within the allowable error range of the resonant cavity current reference value and limiting it to not exceed the maximum current limit.

[0128] In one feasible implementation, the plurality of preset drive states include six drive states that cycle sequentially.

[0129] Drive states one, three, and five have a first type of level combination sequence; drive states two, four, and six have a second type of level combination sequence.

[0130] Each level combination sequence contains three level combinations executed sequentially. The duration of the first two level combinations is determined by a preset dead time and / or a preset minimum on-time, respectively. The duration of the third level combination is determined by any of the following conditions: The active current sampling value reaches the resonant cavity current reference value.

[0131] The active current sample value exceeds the preset maximum current limit.

[0132] The duration of the second level combination in the current driving state has reached the preset minimum conduction time; wherein, when any condition is met, the third level combination of the current driving state is terminated and the first level combination of the next driving state is switched to achieve cycle-by-cycle control of the peak current of the resonant cavity.

[0133] In one feasible implementation, the dead time is the shoot-through protection time when two complementary power switches in the same phase switch, and the minimum conduction time is the shortest conduction time to ensure the normal operation of the resonant cavity.

[0134] In one feasible implementation, the extraction module is used to extract the active current component from the actual resonant current, for the following purposes: The actual resonant current is rectified by a controllable rectifier circuit to remove the reactive current component.

[0135] In one feasible implementation, the device further includes: The compensation module is used to introduce a slope compensation signal after the actual resonant current is controlled and rectified, so as to suppress the subharmonic oscillation of the loop.

[0136] In one feasible implementation, the generation module is used to generate a resonant cavity current reference value for: The difference between the output voltage and the target voltage, and the output current used to characterize load changes, are input to a proportional-integral-derivative (PID) controller, and the output of the PID controller is used as the reference value for the resonant cavity current.

[0137] This application provides a method, apparatus, device, and medium for controlling the peak current of a resonant cavity in a data center power supply system. The method involves acquiring the output voltage and current of a three-phase LLC resonant converter and generating a resonant cavity current reference value based on a preset target voltage. Simultaneously, a current detection circuit in each phase's resonant cavity current path acquires the actual resonant current and extracts its active current component, obtaining active current sampling values ​​for each phase. These active current sampling values ​​are then compared with the resonant cavity current reference value to generate corresponding target square wave signals. Finally, based on the current magnitude relationship represented by the target square wave signals, a preset state machine generates pulse width modulation (PWM) pulse signals to drive the power switching transistors, controlling the converter to switch between multiple preset drive states cycle by cycle, thereby precisely controlling the peak current of the resonant cavity within the allowable error range of the resonant cavity current reference value.

[0138] Compared with the existing technology that relies on frequency modulation control, has a slow response speed, and is difficult to limit the resonant cavity current quickly and accurately, the embodiments of this application introduce active current extraction, phase-by-phase comparison and state machine dynamic switching mechanism to achieve fast response and cycle-by-cycle precise control of the resonant cavity current, which can effectively solve the problems of resonant cavity overcurrent and control response lag when switching large dynamic loads.

[0139] Figure 7A schematic diagram of an electronic device provided in this application embodiment includes: a processor 701, a storage medium 702, and a bus 703. The storage medium 702 stores machine-readable instructions executable by the processor 701. When the electronic device runs the resonant cavity peak current control method for data center power supply as described in the embodiment, the processor 701 communicates with the storage medium 702 via the bus 703, and the processor 701 executes the machine-readable instructions to perform the steps as described in the embodiment.

[0140] In this embodiment, the storage medium 702 may also execute other machine-readable instructions to perform other methods as described in the embodiment. For details on the specific execution steps and principles, please refer to the description of the embodiment, which will not be repeated here.

[0141] This application also provides a computer-readable storage medium storing a computer program that is executed by a processor to perform the steps as described in the embodiments.

[0142] In this embodiment, the computer program, when run by the processor, can also execute other machine-readable instructions to perform other methods as described in the embodiments. For details on the specific execution steps and principles, please refer to the description of the embodiments, which will not be repeated here.

[0143] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the division of modules is only a logical functional division, and in actual implementation, there may be other division methods. Furthermore, multiple modules or components may be combined or integrated into another system, or some features may be ignored or not executed. Additionally, the coupling or direct coupling or communication connection shown or discussed may be through some communication interface; the indirect coupling or communication connection between apparatuses or modules may be electrical, mechanical, or other forms.

[0144] The modules described as separate components may or may not be physically separate. The components shown as modules may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0145] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0146] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a processor-executable, non-volatile, computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, ROM, RAM, magnetic disks, or optical disks.

[0147] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for controlling the peak current of a resonant cavity in a data center power supply, characterized in that, The method includes: The output voltage and output current of the three-phase LLC resonant converter are collected, and a resonant cavity current reference value is generated based on the output voltage, the output current and the preset target voltage. By using a current detection circuit installed in the current path of each phase of the resonant cavity, the actual resonant current of the resonant cavity is collected, and the active current component in the actual resonant current is extracted to obtain the active current sampling value. The active current sampling value of each phase is compared with the resonant cavity current reference value, and the corresponding target square wave signal is generated based on the comparison result. Based on the relationship between the active current sample value represented by the target square wave signal of each phase and the resonant cavity current reference value, a pulse width modulation pulse signal is generated through a preset state machine to drive the power switching transistors in the three-phase LLC resonant converter. The pulse width modulation pulse signal is used to control the three-phase LLC resonant converter to switch between multiple preset driving states cycle by cycle, so as to control the peak current of the resonant cavity within the allowable error range of the resonant cavity current reference value.

2. The method according to claim 1, characterized in that, The pulse width modulation pulse signal is used to control the three-phase LLC resonant converter to cycle between multiple preset driving states in a fixed sequence; Each driving state includes a fixed three-phase level combination sequence, and the duration of the last level combination in each driving state is determined by whether at least one of the following two conditions is met: whether the active current sample value reaches the resonant cavity current reference value, or whether the active current sample value exceeds the preset maximum current limit. When any condition is met, the last level combination of the current driving state is terminated and the next driving state is switched, thereby controlling the peak current of the resonant cavity within the allowable error range of the resonant cavity current reference value and limiting it to not exceed the maximum current limit.

3. The method according to claim 2, characterized in that, The plurality of preset drive states include six drive states that cycle sequentially. Drive states one, three, and five have a first type of level combination sequence; drive states two, four, and six have a second type of level combination sequence. Each level combination sequence contains three level combinations executed sequentially. The duration of the first two level combinations is determined by a preset dead time and / or a preset minimum on-time, respectively. The duration of the third level combination is determined by any of the following conditions: The active current sampling value reaches the resonant cavity current reference value; The active current sample value exceeds the preset maximum current limit; The duration of the second level combination in the current driving state has reached the preset minimum conduction time; wherein, when any condition is met, the third level combination of the current driving state is terminated and the first level combination of the next driving state is switched to achieve cycle-by-cycle control of the peak current of the resonant cavity.

4. The method according to claim 3, characterized in that, The dead time is the shoot-through protection time when two complementary power switches in the same phase switch, and the minimum conduction time is the shortest conduction time to ensure the normal operation of the resonant cavity.

5. The method according to claim 1, characterized in that, Extracting the active current component from the actual resonant current includes: The actual resonant current is rectified by a controllable rectifier circuit to remove the reactive current component.

6. The method according to claim 5, characterized in that, The method further includes: After the actual resonant current is rectified in a controllable manner, a slope compensation signal is introduced to suppress the subharmonic oscillation of the loop.

7. The method according to claim 1, characterized in that, The generated resonant cavity current reference value includes: The difference between the output voltage and the target voltage, and the output current used to characterize load changes, are input to a proportional-integral-derivative (PID) controller, and the output of the PID controller is used as the reference value for the resonant cavity current.

8. A resonant cavity peak current control device for data center power supply, characterized in that, The device includes: The generation module is used to acquire the output voltage and output current of the three-phase LLC resonant converter, and generate a resonant cavity current reference value based on the output voltage, the output current and the preset target voltage. The extraction module is used to collect the actual resonant current of the resonant cavity through the current detection circuit set in the current path of each phase of the resonant cavity, and extract the active current component in the actual resonant current to obtain the active current sampling value. The comparison module is used to compare the active current sampling value of each phase with the resonant cavity current reference value, and generate the corresponding target square wave signal based on the comparison result. The driving module is used to generate pulse width modulation (PWM) pulse signals to drive the power switching transistors in the three-phase LLC resonant converter based on the relationship between the active current sample value represented by the target square wave signal of each phase and the resonant cavity current reference value through a preset state machine. The PWM pulse signals are used to control the three-phase LLC resonant converter to switch between multiple preset driving states cycle by cycle, so as to control the peak current of the resonant cavity within the allowable error range of the resonant cavity current reference value.

9. An electronic device, characterized in that, include: The device includes a processor, a storage medium, and a bus, wherein the storage medium stores machine-readable instructions executable by the processor, and when the electronic device is running, the processor communicates with the storage medium via the bus, and the processor executes the machine-readable instructions to perform the steps of the resonant cavity peak current control method for data center power supply as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, performs the steps of the resonant cavity peak current control method for data center power supply as described in any one of claims 1 to 7.

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