Power supply device of LLC topological structure capable of configuring resonant inductor

Abstract

The utility model discloses an LLC topological structure power supply device capable of configuring a resonant inductor. The LLC topological structure power supply device comprises an inverter network, a resonant network and a rectification filter network. The resonant network comprises a resonant inductor assembly and a resonant capacitor; the resonant inductor assembly comprises five resonant inductors Lr1, Lr2, Lr3, Lr4 and Lr5 which are connected in parallel; and each resonant inductor is correspondingly provided with an independent control switch which is controlled by the CPU. According to the LLC topological structure, the resonant cavity is enabled to quickly achieve resonance (namely, the resonant frequency is equal to the working frequency) through a hardware mode, the LLC topological structure can quickly work in a resonance state, the frequency of finding a resonant frequency point through a software algorithm is effectively reduced, and the working efficiency of the LLC topological structure is greatly improved. The delay caused by calculating the voltage loop and the current loop through the PID algorithm is reduced, and the stability of the output voltage of the power supply is improved.

Description

Technical Field

[0001] The utility model relates to a power supply device, in particular to a power supply device with an LLC topology structure capable of configuring a resonant inductor. Background Art

[0002] With the increasingly wide demand for power modules in the market, the rapid response, high stability, and high dynamic response of the power output voltage loop are particularly prominent in the field of semiconductor devices. At present, there is a lack of a DC sputtering power supply device that can be autonomously controlled, has a high dynamic response to the load, and is highly stable. To ensure the high dynamic response of the power supply itself, improve the stability of the project power supply, improve the level of power supply products, and promote the development of semiconductor devices, it is necessary to improve the shortcomings of the current LLC topology structure of power conversion technology.

[0003] Considering the high-power LLC topology structure studied in the present utility model, the power supply has a large output power, a wide output voltage range, and high efficiency requirements. The circuit scheme designed in the present utility model mainly improves the existing LLC topology structure.

[0004] Brief introduction of the LLC topology circuit in the prior art:

[0005] The main circuit structure of a complete full-bridge LLC resonant converter is as Figure 2 shown. After modularizing the main circuit of the converter, it can be divided into: an inverter network, a resonant network, and a rectifier and filter network.

[0006] Figure 1 In, Q1 to Q4 are main power switching tubes, D1 to D4, and C1 to C4 are their body diodes and parasitic capacitances between their drain and source electrodes respectively. Tr is the main power transformer. DR1 and DR2 are output rectifier diodes, Cf is the output filter capacitor, and RLd is the load resistor. The resonant inductor Lr (including the primary leakage inductance of the transformer), the magnetizing inductor Lm, and the resonant capacitor Cr form the resonant network of the LLC resonant converter. Among them, the magnetizing inductor Lm is integrated in the transformer; the resonant capacitor Cr is connected in series in the primary circuit and also acts as a DC blocking capacitor.

[0007] Brief introduction of the LLC working principle, as Figure 2 shown:

[0008] According to the magnitude relationship between the switching frequency fs and the resonant frequency fr, the LLC resonant converter has the following three working modes:

[0009] Working mode 1: fs < fr, and the main working waveforms of the converter at this time are as Figure 2As shown in (a). In this mode, when the resonant inductor current iLr resonates to be equal to the magnetizing inductor current iLm, as shown in [t2~t4] in the figure, the magnetizing inductor Lm participates in the resonance, and the rectifier diode current is discontinuous. Therefore, the rectifier diode can achieve ZCS turn-off.

[0010] Working mode 2: fs = fr, the main working waveform is as follows Figure 2 As shown in (b), the magnetizing inductor Lm no longer participates in resonance, and its voltage is constantly clamped at nVo by the output voltage. The rectifier diode current is critically continuous, thus ZCS turn-off can also be achieved.

[0011] Working mode 3: fs>fr, working waveform as follows Figure 2 As shown in (c), in this mode, the magnetizing inductor Lm does not participate in resonance, and its voltage is always clamped at nVo. The rectifier diode current is continuous, operating in hard-shutdown mode, thus exhibiting a reverse recovery problem.

[0012] shortcoming:

[0013] When the load fluctuates dynamically from 0-25%-50%-75%-100%, the CPU needs to calculate the equivalent load mapped to the primary side and determine the corresponding switching frequency. The CPU needs to sample the output voltage and output current and then perform calculations using a PID algorithm, which consumes a lot of time. At the same time, this causes fluctuations in the output voltage, making it unable to respond promptly to the load's current demand. This is especially true in special applications such as powering robotic arms, where high requirements are placed on the output load regulation rate, particularly for large dynamic load fluctuations, where the output voltage cannot fluctuate significantly.

[0014] Disadvantages of existing technology:

[0015] The disadvantages of the existing LLC topology are: Lr and Cr are fixed. When the load fluctuates dynamically from 0 to 25% to 50% to 75% to 100%, the CPU of the existing LLC topology uses the PID algorithm to find a suitable resonant frequency. During the calculation process, a lot of CPU computing resources are consumed, resulting in fluctuations and instability in the output voltage loop.

[0016] The drawbacks of existing PID algorithms for LLC are:

[0017] When the load fluctuates significantly, as the output voltage of the power module continuously decreases, the output voltage is adjusted using a PID algorithm. This involves calculating the equivalent impedance Lm reflected from the secondary side to the primary side, the resonant inductance Lr1, and the resonant frequency of the resonant capacitor. Then, the output voltage is stabilized by adjusting the PWM frequency. The output voltage drops by about 5% from 100% and is then adjusted back, causing the output voltage to fluctuate between 100% and 95%. This cannot quickly meet the load current requirements. Therefore, the traditional LLC PID algorithm can no longer meet the high stability response requirements of the output voltage loop for semiconductor equipment robotic arms.

[0018] In view of the above, this utility model is hereby proposed. Utility Model Content

[0019] The purpose of this invention is to provide a power supply device with a configurable resonant inductor LLC topology to solve the aforementioned technical problems in the prior art.

[0020] The objective of this utility model is achieved through the following technical solution:

[0021] The present invention relates to a power supply device with a configurable resonant inductor LLC topology, comprising an inverter network, a resonant network, and a rectifier filter network.

[0022] The resonant network includes a resonant inductor component and a resonant capacitor, wherein the resonant inductor component includes multiple resonant inductors connected in parallel.

[0023] Compared with the prior art, the power supply device with configurable resonant inductor LLC topology provided by this utility model enables the resonant cavity to quickly reach resonance (i.e., the resonant frequency equals the operating frequency) through hardware, allowing the LLC topology to quickly operate in the resonant state. This effectively reduces the need to find the resonant frequency point through software algorithms and greatly improves the working efficiency of the LLC topology. Attached Figure Description

[0024] Figure 1 This is a diagram of the LLC topology in the existing technology;

[0025] Figure 2 This is a schematic diagram of the LLC principle in existing technology.

[0026] Figure 3 A schematic diagram illustrating the structural principle of a power supply device with a configurable resonant inductor LLC topology provided in an embodiment of this utility model. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments, which do not constitute a limitation on the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0028] First, the following explanations are provided for the terms that may be used in this article:

[0029] The term "and / or" means that either or both can be achieved simultaneously. For example, X and / or Y means that it includes both "X" or "Y" as well as the three cases of "X and Y".

[0030] The terms “including,” “comprising,” “containing,” “having,” or other similar semantic descriptions should be interpreted as non-exclusive inclusion. For example, “including a technical feature element (such as raw material, component, ingredient, carrier, dosage form, material, size, part, component, mechanism, device, step, process, method, reaction conditions, processing conditions, parameter, algorithm, signal, data, product or article of manufacture, etc.)” should be interpreted as including not only the expressly listed technical feature element, but also other technical feature elements that are not expressly listed and are well-known in the art.

[0031] The term "composed of" excludes any technical features not expressly listed. When used in a claim, it closes the claim to exclude all technical features other than those expressly listed, except for associated conventional impurities. If the term appears only in a clause of a claim, it limits the claim to the elements expressly listed in that clause; elements recited in other clauses are not excluded from the overall claim.

[0032] The contents not described in detail in the embodiments of this utility model are existing technologies known to those skilled in the art. Where specific conditions are not specified in the embodiments of this utility model, they shall be performed according to conventional conditions in the art or conditions recommended by the manufacturer. Reagents or instruments used in the embodiments of this utility model whose manufacturers are not specified are all conventional products that can be purchased commercially.

[0033] The present invention relates to a power supply device with a configurable resonant inductor LLC topology, comprising an inverter network, a resonant network, and a rectifier filter network.

[0034] The resonant network includes a resonant inductor component and a resonant capacitor, wherein the resonant inductor component includes multiple resonant inductors connected in parallel.

[0035] The resonant inductor assembly includes five resonant inductors connected in parallel, namely Lr1, Lr2, Lr3, Lr4, and Lr5; each resonant inductor is equipped with a separate control switch, namely S1, S2, S3, S4, and S5; each control switch is connected to the CPU, and at least one of the multiple control switches is connected.

[0036] The method for configuring the resonant inductor in the power supply device with the aforementioned configurable resonant inductor LLC topology includes:

[0037] When the CPU detects that the load current is no load, that is, the load is 0, the inductance of the resonant inductor Lr1 is calculated by the hardware; the CPU directly turns on the control switch S1, and at this time the resonant circuit is in the resonant state.

[0038] When the CPU detects that the load current is 25%, it calculates the inductance of the resonant inductor Lr1+Lr2 through hardware; then the CPU directly turns on the control switches S1 and S2, and the resonant circuit is in a resonant state.

[0039] When the CPU detects that the load current is 50%, it calculates the inductance of the resonant inductor Lr1+Lr2+Lr3 through hardware; then the CPU directly turns on the control switches S1, S2, and S3, and the resonant circuit is in a resonant state.

[0040] When the CPU detects that the load current is 75%, it calculates the inductance of the resonant inductor Lr1+Lr2+Lr3+Lr4 through hardware; then the CPU directly connects the control switches S1, S2, S3, and S4, and the resonant circuit is in a resonant state.

[0041] When the CPU detects that the load current is 100%, it calculates the inductance of the resonant inductors Lr1+Lr2+Lr3+Lr4+Lr5 through hardware; then the CPU directly connects the control switches S1, S2, S3, S4, and S5, at which point the resonant circuit is in a resonant state.

[0042] When the load fluctuates arbitrarily under the above-mentioned load conditions, the CPU detects the corresponding load condition and switches to the corresponding load condition, thus keeping the resonant circuit working in the resonant state.

[0043] In summary, the power supply device with a configurable resonant inductor LLC topology according to this embodiment of the invention enables the resonant cavity to quickly reach resonance (i.e., the resonant frequency equals the operating frequency) through hardware, allowing the LLC topology to operate quickly in a resonant state. This effectively reduces the need to find the resonant frequency point through software algorithms, significantly improving the operating efficiency of the LLC topology. It also reduces the delay caused by PID algorithm calculations of the voltage and current loops, thus improving the stability of the power supply output voltage.

[0044] To more clearly demonstrate the technical solution and effects provided by this utility model, the following detailed description of the embodiments of this utility model is provided with reference to specific examples.

[0045] Example 1

[0046] like Figure 3 The diagram shown is a schematic of a power supply device with a configurable resonant inductor LLC topology, wherein:

[0047] When the CPU detects that the load current is no load, that is, the load is 0, the inductance of the resonant inductor Lr1 is calculated by the hardware; the CPU directly turns on S1, and the resonant circuit is in the resonant state.

[0048] When the CPU detects that the load current is 25%, it calculates the inductance of the resonant inductor Lr1+Lr2 through hardware; then the CPU directly connects S1 and S2, and the resonant circuit is in a resonant state.

[0049] When the CPU detects that the load current is 50%, it calculates the inductance of the resonant inductor Lr1+Lr2+Lr3 through hardware; then the CPU directly connects S1, S2, and S3, and the resonant circuit is in a resonant state.

[0050] When the CPU detects that the load current is 75%, it calculates the inductance of the resonant inductor Lr1+Lr2+Lr3+Lr4 through hardware; then the CPU directly connects S1, S2, S3, and S4, and the resonant circuit is in a resonant state.

[0051] When the CPU detects that the load current is 100%, it calculates the inductance of the resonant inductor Lr1+Lr2+Lr3+Lr4+Lr5 through hardware; then the CPU directly connects S1, S2, S3, S4, and S5, and the resonant circuit is in a resonant state.

[0052] Similarly, when the load fluctuates arbitrarily among these four load states, the CPU detects the corresponding load state and switches to the corresponding load state, thus keeping the resonant circuit working in the resonant state.

[0053] The CPU detects the load conditions described above and pre-calculates the corresponding inductance values ​​using hardware. The CPU then directly selects the switch. However, there are special cases where load switching may not follow a 0%-25%-50%-75%-100% pattern. This invention only provides a method; in actual operation, the load may exhibit similar five or more load state fluctuations. Therefore, by setting the corresponding resonant inductor based on the actual load conditions, the resonant circuit remains in a resonant state during rapid load state switching. This ensures the LLC topology always operates at its highest efficiency, eliminating the need for the CPU to continuously run PID voltage and PID current loops, thus saving significant CPU resources. The output voltage still fluctuates to achieve rapid load fluctuation.

[0054] The beneficial effects of this utility model are:

[0055] This technical solution configures the resonant inductor within the resonant cavity according to different load levels, enabling the resonant cavity to quickly achieve resonance (i.e., the resonant frequency equals the operating frequency) through hardware. This allows the LLC topology to operate rapidly in a resonant state, effectively reducing the need for software algorithms to find the resonant frequency point and significantly improving the operating efficiency of the LLC topology. Compared to traditional PID algorithms for achieving resonance of the resonant inductor and capacitor, this power supply device with a configurable resonant inductor for the LLC topology saves the CPU's time spent on complex real-time sampling and calculations, improves the response time of output voltage feedback, and ensures stable and reliable output voltage. Furthermore, it provides a very fast output voltage loop control method for capacitive loads (charger loads) and inductive loads (robotic arm loads) under different load characteristics, demonstrating high practical and promotional value.

[0056] The above description is merely a preferred embodiment of this utility model, but the scope of protection of this utility model 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 utility model should be included within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the scope of the claims. The information disclosed in the background section is intended only to enhance the understanding of the overall background technology of this utility model and should not be construed as an admission or implication in any way that such information constitutes prior art known to those skilled in the art.

Claims

1. A power supply device with a configurable resonant inductor LLC topology, characterized in that, This includes inverter networks, resonant networks, and rectifier filter networks; The resonant network includes a resonant inductor component and a resonant capacitor, wherein the resonant inductor component includes multiple resonant inductors connected in parallel. The resonant inductor assembly includes five resonant inductors connected in parallel, namely Lr1, Lr2, Lr3, Lr4, and Lr5; each resonant inductor is equipped with a separate control switch, namely S1, S2, S3, S4, and S5; each control switch is connected to the CPU, and at least one of the multiple control switches is connected.

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