Soft-switching multiphase interleaving boost converter, use method and control system

Abstract

The invention belongs to the technical field of power electronics, and discloses a multiphase interleaved boost converter of a soft switch, a use method and a control system, the multiphase interleaved boost converter comprises a power supply Vin and three single-phase MIBC units; the positive electrode of the power supply Vin is respectively connected with three inductors in parallel; the other ends of the three inductors are respectively connected with a diode, and the three diodes are all connected with the negative electrode of the power supply Vin; the single-phase MIBC unit comprises a first input end, a second input end, a first output end and a second output end; the first input ends and the second input ends of the three single-phase MIBC units are respectively connected between the three inductors and the three diodes; the first output ends and the second output ends of the three single-phase MIBC units are connected with the negative electrode of the power supply Vin. By adopting an interleaving parallel structure, conduction loss can be reduced, input current ripples and output voltage ripples are suppressed, and the overall rated power is further improved.

Description

Technical Field

[0001] The invention belongs to the technical field of power electronics and relates to a multi-phase interleaved boost converter with soft switching, a use method and a control system. Background Art

[0002] DC / DC converters are widely used in fuel cell vehicles, photovoltaics, UPS, energy storage and other fields due to their energy conversion and voltage regulation functions. With the development of these fields, the performance requirements for converters are increasing, such as power density, response speed, stability and reliability.

[0003] Fuel cell vehicles require DC / DC converters for voltage regulation because of low battery voltage and large fluctuations. Photovoltaic and energy storage systems also often use converters to match output voltages. However, the increase in equipment capacity and power levels has brought challenges to the reliability of power devices in converters. At the same time, the diversity of load characteristics and operating conditions makes it difficult for traditional control algorithms to meet requirements, the system output waveform is easily distorted, and the stability and dynamic performance are reduced.

[0004] The Chinese patent publication number is CN115603578A, and the name is a patent application for a converter based on soft switching and its control method. The converter includes a power supply, a boost module and an output module; the boost module includes a first boost module and a second boost module; the first boost module includes a first input unit, a first resonant unit, and a first resonant capacitor; the first input unit includes a first switch tube, the first resonant unit is connected to the first input unit, and the first resonant unit resonates with the first resonant capacitor; the second boost module includes a second input unit, a second resonant unit, and a second resonant capacitor; the second resonant unit includes a second resonant inductor, the second input unit is connected to the second resonant inductor, and the second resonant inductor resonates with the second resonant capacitor. This patent application cannot reduce conduction loss, and cannot suppress input current ripple and output voltage ripple. Summary of the invention

[0005] In order to overcome the problems existing in the above-mentioned prior art, the purpose of the present invention is to provide a multi-phase interleaved boost converter with soft switching, a method of use and a control system, which has three boost converters, and the converter can work under zero current switching, and when turned off, it can work under zero voltage switching, thereby reducing switching losses and improving switching efficiency. By adopting an interleaved parallel structure, the present invention can reduce conduction losses, suppress input current ripple and output voltage ripple, and thus improve the overall rated power.

[0006] To achieve the above object, the technical solution adopted by the present invention is: In the first aspect, the present invention provides a multi-phase interleaved boost converter with soft switching, comprising: a power supply Vin and three single-phase MIBC units; the positive electrode of the power supply Vin is respectively connected in parallel with three inductors; the other ends of the three inductors are respectively connected with a diode, and the three diodes are all connected to the negative electrode of the power supply Vin; the single-phase MIBC unit comprises: a first input end, a second input end, a first output end, and a second output end; the first input end and the second input end of the three single-phase MIBC units are respectively connected between the three inductors and the three diodes; the first output end and the second output end of the three single-phase MIBC units are both connected to the negative electrode of the power supply Vin; the single-phase MIBC unit comprises: a first resonant inductor Lr1, a second resonant inductor Lr2, a first switch tube S1, a first resonant capacitor Cr1, the fourth diode D4, the second switch tube S2 and the second resonant capacitor Cr2; the first end of the first resonant inductor Lr1 and the first end of the first resonant capacitor Cr1 are respectively the first input end and the second input end of the single-phase MIBC unit; the source of the second switch tube S2 and the second end of the second resonant capacitor Cr2 are respectively the first output end and the second output end of the single-phase MIBC unit; the second end of the first resonant inductor Lr1 is connected to the drain of the first switch tube S1; the source of the first switch tube S1 is connected to the anode of the fourth diode D4 and the first end of the second resonant capacitor Cr2; the first end of the second resonant inductor Lr2 is connected to the cathode of the fourth diode D4 and the second end of the first resonant capacitor Cr1, and the second end of the second resonant inductor Lr2 is connected to the drain of the second switch tube S2.

[0007] Optionally, the three inductors are respectively a first inductor L1, a second inductor L2, and a third inductor L3, and the three diodes are respectively a first diode D1, a second diode D2, and a third diode D3; the positive electrode of the power supply Vin is respectively connected to the first end of the first inductor L1, the first end of the second inductor L2, and the first end of the third inductor L3; the second end of the first inductor L1 is connected to the anode of the first diode D1, the second end of the second inductor L2 is connected to the anode of the second diode D2, and the second end of the third inductor L3 is connected to the anode of the third diode D3; the cathode of the first diode D1, the cathode of the second diode D2, and the cathode of the third diode D3 are all connected to the negative electrode of the power supply Vin.

[0008] Optionally, the first diode D1, the second diode D2 and the third diode D3 are all connected to the negative electrode of the power supply Vin through the capacitor C0, the cathodes of the first diode D1, the second diode D2 and the third diode D3 are all connected to the first end of the load resistor R0, and the second end of the load resistor R0 is connected to the negative electrode of the power supply Vin.

[0009] Optionally, the first diode D1, the second diode D2 and the third diode D3 are also connected to a capacitor C0, the cathodes of the first diode D1, the second diode D2 and the third diode D3 are all connected to the first end of the capacitor C0, and the second end of the capacitor C0 is connected to the negative electrode of the power supply Vin.

[0010] Optionally, both the first switch tube S1 and the second switch tube S2 are Infineon IPP60R099C6 switch tubes.

[0011] Optionally, the first resonant inductor Lr1 is a Coilcraft SER2010-102ML inductor.

[0012] Optionally, the first resonant capacitor Cr1 and the second resonant capacitor Cr2 are both Kemet C322C104K1R5TA capacitors.

[0013] In a second aspect, the present invention provides a method for using the multi-phase interleaved boost converter with soft switching, comprising the following steps: At the beginning of the working cycle, the first switch tube S1 and the second switch tube S2 are operated simultaneously; At the end of the working cycle, the first switch tube S1 and the second switch tube S2 are operated simultaneously again.

[0014] In a third aspect, the present invention provides an active disturbance rejection control system for controlling a multi-phase interleaved boost converter with soft switching, comprising: A tracking differentiator, used for inputting a voltage Vin, and outputting a tracking signal voltage V1 and a differential signal voltage V2; A first subtractor, used for comparing the input tracking signal voltage V1 with the tracking signal result z1 of the extended state observer, and outputting a first difference value e1; A second subtractor, used for comparing the input differential signal voltage V2 with the differential signal result z2 of the extended state observer, and outputting a second difference value e2; A linear feedback controller, used to input a first difference e1 and a second difference e2, and output a correction voltage u0; A disturbance compensator, which is used to input a correction voltage u0 and an output result of the second multiplier, and output a compensation voltage u1; A first multiplier, used for calculating the product of the system gain bo and the compensation voltage u1; a second multiplier, used for calculating the product of the inverse of the system gain bo and the total disturbance value of the first extended state observer; The third subtractor is used to input the compensation voltage u1 and the current i of the multi-phase interleaved boost converter of the soft switch DC , output the third difference; The Pi controller is used to input the third difference e3 and output the duty cycle to the first switch tube S1 and the second switch tube S2 of the multi-phase interleaved boost converter of the soft switch; The first extended state observer is used to input the system gain bo and the voltage U of the soft-switched multi-phase interleaved boost converter DC The outputs are the estimated value Z1 of the tracking signal voltage V1 and the estimated value Z2 of the differential signal voltage V2.

[0015] In a fourth aspect, the present invention provides a second-order linear active disturbance rejection control system for controlling a multi-phase interleaved boost converter with soft switching, comprising: Linear feedback rate calculator, used to input topological voltage reference Uref, system first output differential term z11, system second output differential term z21, and output correction voltage u01; A subtractor for calculating the difference e between the correction voltage u01 and the estimated value z31 of the total disturbance x3; a third multiplier, used for calculating the product of the difference value e and the inverse of the system gain b01, to obtain an input voltage U of a controller of a power supply Vin of the multi-phase interleaved boost converter for the soft switch; a fourth multiplier, used for calculating the product of the input voltage U of the controller and the inverse of the system gain b01; The second extended state observer is used to input the result of the fourth multiplier and the output voltage y of the soft-switching multi-phase interleaved boost converter; and output the system first output differential term z11, the system second output differential term z21 and the estimated value z3 of the total disturbance.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention discloses a novel soft-switching multi-phase interleaved boost converter, which includes three boost converters, indicating that the converter can operate under zero current switching, and when turned off, it can operate under zero voltage switching, thereby reducing switching losses and improving switching efficiency. By adopting an interleaved parallel structure, the converter can reduce conduction losses, suppress input current ripple and output voltage ripple, and thus improve the overall rated power. At the same time, in order to solve the problems of reduced control accuracy and poor anti-disturbance ability of traditional control methods, an anti-disturbance control algorithm is introduced to improve its anti-disturbance ability and robustness. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are for explanation purposes only and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the components in the drawings are only for illustration purposes to help understand the present invention, and are not intended to specifically limit the shapes and proportional dimensions of the components of the present invention. In the drawings: Figure 1The schematic diagram is a structural diagram of a novel soft-switching multi-phase interleaved boost converter of the present invention.

[0018] Figure 2 4 is a control block diagram of an active disturbance rejection control system according to an embodiment of the present invention.

[0019] Figure 3 4 is a control block diagram of a second-order linear active disturbance rejection control system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the invention is usually placed when used. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0023] When an element is referred to as being "disposed on" another element, it may be directly on the other element or there may also be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may also be a central element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiments. If the term "horizontal" appears, it does not mean that the component is required to be absolutely horizontal, but it can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but it can be slightly tilted.

[0024] It should be noted that similar reference numerals and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further defined and explained in the subsequent figures. In the description of the present invention, it is understood that the terms "include" and "comprise" indicate the presence of the described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or their collections.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, the singular forms of "a", "an" and "the" are intended to include plural forms unless the context clearly indicates otherwise.

[0026] The present invention is described in detail below with reference to the accompanying drawings.

[0027] A multi-phase interleaved boost converter with soft switching according to an embodiment of the present invention comprises: a power supply Vin and three single-phase MIBC units 1; the positive electrode of the power supply Vin is respectively connected in parallel with three inductors; the other ends of the three inductors are respectively connected with a diode, and the three diodes are all connected to the negative electrode of the power supply Vin; the single-phase MIBC unit 1 comprises: a first input end, a second input end, a first output end, and a second output end; the first input end and the second input end of the three single-phase MIBC units 1 are respectively connected between the three inductors and the three diodes; the first output end and the second output end of the three single-phase MIBC units 1 are both connected to the negative electrode of the power supply Vin; the single-phase MIBC unit 1 comprises: a first resonant inductor Lr1, a second resonant inductor Lr2, a first switch tube S1, a first resonant capacitor Cr1, the fourth diode D4, the second switch tube S2 and the second resonant capacitor Cr2; the first end of the first resonant inductor Lr1 and the first end of the first resonant capacitor Cr1 are respectively the first input end and the second input end of the single-phase MIBC unit 1; the source of the second switch tube S2 and the second end of the second resonant capacitor Cr2 are respectively the first output end and the second output end of the single-phase MIBC unit 1; the second end of the first resonant inductor Lr1 is connected to the drain of the first switch tube S1; the source of the first switch tube S1 is connected to the anode of the fourth diode D4 and the first end of the second resonant capacitor Cr2; the first end of the second resonant inductor Lr2 is connected to the cathode of the fourth diode D4 and the second end of the first resonant capacitor Cr1, and the second end of the second resonant inductor Lr2 is connected to the drain of the second switch tube S2.

[0028] The three inductors are respectively a first inductor L1, a second inductor L2, and a third inductor L3; the three diodes are respectively a first diode D1, a second diode D2, and a third diode D3; the positive electrode of the power supply Vin is respectively connected to the first end of the first inductor L1, the first end of the second inductor L2, and the first end of the third inductor L3; the second end of the first inductor L1 is connected to the anode of the first diode D1, the second end of the second inductor L2 is connected to the anode of the second diode D2, and the second end of the third inductor L3 is connected to the anode of the third diode D3; the cathode of the first diode D1, the cathode of the second diode D2, and the cathode of the third diode D3 are all connected to the negative electrode of the power supply Vin.

[0029] The present invention discloses a novel soft-switching multi-phase interleaved boost converter, which includes three boost converters, indicating that the converter can operate under zero current switching, and when turned off, it can operate under zero voltage switching, thereby reducing switching losses and improving switching efficiency. By adopting an interleaved parallel structure, the converter can reduce conduction losses, suppress input current ripple and output voltage ripple, and thus improve the overall rated power. At the same time, in order to solve the problems of reduced control accuracy and poor anti-disturbance ability of traditional control methods, an anti-disturbance control algorithm is introduced to improve its anti-disturbance ability and robustness.

[0030] Example 1 The device components involved in the above embodiments are as follows Figure 1 As shown, a novel soft-switching multi-phase interleaved boost converter in the present invention includes: a power source Vin, a single-phase MIBC (MIBC, Multi-phase Interleaved Boost Converter) unit 1, a first inductor L1, a second inductor L2, a third inductor L3, a capacitor C0, a load resistor R0, a first diode D1, a second diode D2 and a third diode D3; The positive electrode of the power source Vin is respectively connected to the first end of the first inductor L1, the first end of the second inductor L2, and the first end of the third inductor L3; The second end of the first inductor L1 is connected to the anode of the first diode D1, the second end of the second inductor L2 is connected to the anode of the second diode D2, and the second end of the third inductor L3 is connected to the anode of the third diode D3; The cathode of the first diode D1, the cathode of the second diode D2 and the cathode of the third diode D3 are all connected to the first end of the capacitor C0 and the first end of the load resistor R0; The single-phase MIBC unit 1 comprises: a first input end, a second input end, a first output end and a second output end; the number of the single-phase MIBC units 1 is three; the first input end and the second input end of the three single-phase MIBC units 1 are respectively connected between the second end of the first inductor L1 and the anode of the first diode D1, between the second end of the second inductor L2 and the anode of the second diode D2, and between the second end of the third inductor L3 and the anode of the third diode D3; the first output end and the second output end of the three single-phase MIBC units 1, the second end of the capacitor C0 and the second end of the load resistor R0 are all connected to the negative electrode of the power supply Vin; The single-phase MIBC unit 1 includes: a first resonant inductor Lr1, a first switch tube S1, a first resonant capacitor Cr1, a fourth diode D4, a second switch tube S2 and a second resonant capacitor Cr2; the first end of the first resonant inductor Lr1 and the first end of the first resonant capacitor Cr1 are respectively the first input end and the second input end of the single-phase MIBC unit 1; The second end of the first resonant inductor Lr1 is connected to the drain of the first switch tube S1; the source of the first switch tube S1 is connected to the anode of the fourth diode D4 and the first end of the second resonant capacitor Cr2; the cathode of the fourth diode D4 is connected to the drain of the second switch tube S2 through the inductor, and the source of the second switch tube S2 and the second end of the second resonant capacitor Cr2 are respectively the first output end and the second output end of the single-phase MIBC unit 1.

[0031] The present invention uses an auxiliary resonant circuit and adopts a dual-loop control method to achieve fast transient response, wherein one loop limits the inductor current and the other loop limits the ripple of the output voltage.

[0032] ARC (Auxiliary Resonant Circuit) consists of the first resonant inductor Lr1 and the second resonant inductor Lr2 in series with the first switch tube S1 and the second switch tube S2, and two resonant capacitors Cr1 and Cr2 in parallel with the inductor and the switch. OF (Output Filter) with load and resistor R0 is connected in parallel with capacitor C0 to smooth the OVR (Output Voltage Ripple).

[0033] In this embodiment: The first switch tube S1 and the second switch tube S2 are both Infineon IPP60R099C6 switch tubes (600V, 20A, 99mΩ), which are suitable for a switching frequency of 100kHz.

[0034] The first diode D1, the second diode D2 and the third diode D3 are all STMicroelectronics STPS20M100S diodes (100V, 20A), which are suitable for high-efficiency, low-loss rectification applications.

[0035] The first resonant inductor Lr1 and the second resonant inductor Lr2 are both Coilcraft SER2010-102ML resonant inductors (10µH, 2.2A), which are suitable for high-frequency resonant circuits.

[0036] The first inductor L1, the second inductor L2, and the third inductor L3 all use Bourns SRU1048-470Y inductors (470µH, 1.04A), which are suitable for high inductance filter circuits.

[0037] The first resonant capacitor Cr1 and the second resonant capacitor Cr2 are both Kemet C322C104K1R5TA resonant capacitors (100nF, 100V), which are suitable for high-frequency resonant circuits.

[0038] Capacitor C0 uses Panasonic EEU-FR1V471 capacitor (470µF, 35V), which is suitable for output filtering and has low ESR and high reliability.

[0039] The PI controller uses Texas Instruments UCC2808A, which is suitable for high-frequency switching power supplies and supports voltage mode control.

[0040] Example 2 like Figure 2 The figure shows an active disturbance rejection control system of this embodiment, comprising: A tracking differentiator, used for inputting a voltage Vin, and outputting a tracking signal voltage V1 and a differential signal voltage V2; A first subtractor, used for comparing the input tracking signal voltage V1 with the tracking signal result z1 of the extended state observer, and outputting a first difference value e1; A second subtractor, used for comparing the input differential signal voltage V2 with the differential signal result z2 of the extended state observer, and outputting a second difference value e2; A linear feedback controller, used to input a first difference e1 and a second difference e2, and output a correction voltage u0; A disturbance compensator, which is used to input a correction voltage u0 and an output result of the second multiplier, and output a compensation voltage u1; A first multiplier, used for calculating the product of the system gain bo and the compensation voltage u1; a second multiplier, used for calculating the product of the inverse of the system gain bo and the total disturbance value of the first extended state observer; The third subtractor is used to input the compensation voltage u1 and the current i of the multi-phase interleaved boost converter of the soft switch DC , output the third difference; The Pi controller is used to input the third difference e3 and output the duty cycle to the first switch tube S1 and the second switch tube S2 of the multi-phase interleaved boost converter of the soft switch; The first extended state observer is used to input the system gain bo and the voltage U of the soft-switched multi-phase interleaved boost converter DC The outputs are the estimated value Z1 of the tracking signal voltage V1 and the estimated value Z2 of the differential signal voltage V2.

[0041] Example 3 like Figure 3 A second-order LADCR control system of this embodiment is shown, comprising: Linear feedback rate calculator for input topology voltage reference uref and output correction voltage u0 A subtractor, which is used to input the correction voltage u0 and the estimated value z3 of the total disturbance x3, and output the difference e; The accused is Figure 1 The soft-switching multi-phase interleaved boost converter shown includes components such as power switches, inductors, capacitors, and loads.

[0042] The extended state observer is used to input the controller input u and the system output y, and output the differential terms z1, z2 of the system output and the estimated value z3 of the total disturbance; The efficiency of the converter is improved by reducing ripple current and saving energy through the interleaved structure, and the phase difference around each converter is 120 degrees, making all phases of the MIBC symmetrical.

[0043] The specific operation steps of the control method of the present invention are described below: First, if Figure 1 As shown, the converter is able to operate the first switch tube S1 and the second switch tube S2 simultaneously at the beginning of the working cycle to achieve ZCS (zero current switching), and operate them together again at the end of the working cycle to achieve ZVS (zero voltage switching), thereby reducing switching losses and improving switching efficiency.

[0044] The second switch S2 works with the first switch S1 during the entire operation period, which results in increased circuit loss and reduced efficiency. The proposed MIBC is divided into two stages.

[0045] The first phase of the cycle is when switch S1 is turned on, the current flows from the voltage source to the inductor, then through switch S2 and back to the voltage source. During this period, the inductor stores part of the current passing through it. The second phase is when switch S1 is turned off, the inductor releases the current stored in the load. The voltage at the load terminal is the sum of the inductor and source voltages.

[0046] Next, the estimated losses of the converter are losses caused by passive components (capacitors and inductors) and semiconductor switches (IGBTs and diodes). Use this estimate to calculate the efficiency. The efficiency of the converter is calculated as follows:

[0047] Where η is the efficiency of the converter; P input is the input power; losses is the total loss of the converter, including the losses of passive components (capacitors and inductors) and semiconductor switches (IGBTs and diodes).

[0048] Assume that in the CCM stage, the RMS current values ​​of different parts of the converter are as follows:

[0049] Where IL-rms is the RMS value of the inductor current; I0 ​​is the output current; ΔIL is the ripple of the inductor current; IC-rms is the RMS value of the capacitor current. D is the duty cycle. ID-rms is the RMS value of the diode current. Ii: is the input current.

[0050] Calculating the RMS current of different parts as the first step to evaluate the switching loss, the mathematical model for evaluating the loss of each component is as follows: Conduction losses or copper losses of an inductor:

[0051] Capacitor losses:

[0052] Conduction loss of diode:

[0053] in, P L is the conduction loss or copper loss of the inductor; R L is the resistance of the inductor; P C is the loss of the capacitor; R C is the equivalent series resistance (ESR) of the capacitor; P D is the conduction loss of the diode; V f is the forward voltage drop of the diode; I in is the average current of the diode; K is a constant related to the working state of the diode.

[0054] Finally, traditional converters are usually controlled by dual closed-loop PI controllers. The advantages of this method are simple structure and easy engineering implementation; however, the anti-interference ability is poor, the control accuracy is limited, and the parameter adjustment mainly adopts the trial and error method, which tests the experience of researchers. Therefore, in the present invention, an improved dual closed-loop controller is proposed for the staggered parallel boost converter to deal with the uncertain disturbances that occur in actual engineering. The structure of the dual closed-loop controller of the present invention is as follows: Figure 2 As shown. Combining the principle of active disturbance rejection control, a second-order linear active disturbance rejection controller is designed. Its second-order LADRC control block diagram is shown as follows Figure 3 shown.

[0055] Among them, uref is the topological input voltage reference, y is the output, z1, z2, z3 are the estimated values ​​of the differential term x of the system output x1, x1 and the total disturbance x3, and b0 is the system gain. Write the state space equation for it, that is:

[0056] in, x ˙ is the state vector x The time derivative of x is the state vector, which usually includes the state variables of the system (such as voltage, current, etc.); A is the state matrix, which describes the dynamic relationship of the internal state of the system; B is the input matrix, describing the impact of the input on the state; u is the input vector; E is the disturbance matrix, describing the impact of external disturbance on the state; f is the external disturbance vector; y is the output vector; C is the output matrix, describing the influence of the state on the output.

[0057] The voltage outer loop adopts the LADRC controller to enhance the anti-interference ability of the system; the current inner loop retains the PI controller to meet the rapidity requirements of the system.

[0058] The present invention discloses a novel soft-switching multi-phase interleaved boost converter, which includes three boost converters. This indicates that the converter can operate under zero current switching, and when turned off, it can operate under zero voltage switching, thereby reducing switching losses and improving switching efficiency. By adopting an interleaved parallel structure, the converter can reduce conduction losses, suppress input current ripple and output voltage ripple, and thus improve the overall rated power. At the same time, in order to solve the problems of reduced control accuracy and poor anti-disturbance ability of traditional control methods, an anti-disturbance control algorithm is introduced to improve its anti-disturbance ability and robustness, making it more convenient and efficient in use.

[0059] It is specially noted that they are all conventional equipment components, and the structural settings, working methods or control methods involved are all conventional settings, working methods or control methods in the art unless otherwise specified.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in the field should be included in the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. A multi-phase interleaved boost converter with soft switching, characterized in that: include: A power supply Vin and three single-phase MIBC units (1); the positive electrode of the power supply Vin is respectively connected in parallel with three inductors; the other ends of the three inductors are respectively connected with a diode, and the three diodes are all connected to the negative electrode of the power supply Vin; the single-phase MIBC unit (1) comprises: a first input end, a second input end, a first output end, and a second output end; the first input end and the second input end of the three single-phase MIBC units (1) are respectively connected between the three inductors and the three diodes; the first output end and the second output end of the three single-phase MIBC units (1) are both connected to the negative electrode of the power supply Vin; the single-phase MIBC unit (1) comprises: a first resonant inductor Lr1, a second resonant inductor Lr2, a first switch tube S1, a first resonant capacitor Cr1, a fourth diode D 4. a second switch tube S2 and a second resonant capacitor Cr2; the first end of the first resonant inductor Lr1 and the first end of the first resonant capacitor Cr1 are respectively the first input end and the second input end of the single-phase MIBC unit (1); the source of the second switch tube S2 and the second end of the second resonant capacitor Cr2 are respectively the first output end and the second output end of the single-phase MIBC unit (1); the second end of the first resonant inductor Lr1 is connected to the drain of the first switch tube S1; the source of the first switch tube S1 is connected to the anode of the fourth diode D4 and the first end of the second resonant capacitor Cr2; the first end of the second resonant inductor Lr2 is connected to the cathode of the fourth diode D4 and the second end of the first resonant capacitor Cr1, and the second end of the second resonant inductor Lr2 is connected to the drain of the second switch tube S2.

2. The multi-phase interleaved boost converter with soft switching according to claim 1, characterized in that: The three inductors are respectively a first inductor L1, a second inductor L2, and a third inductor L3; the three diodes are respectively a first diode D1, a second diode D2, and a third diode D3; the positive electrode of the power supply Vin is respectively connected to the first end of the first inductor L1, the first end of the second inductor L2, and the first end of the third inductor L3; the second end of the first inductor L1 is connected to the anode of the first diode D1, the second end of the second inductor L2 is connected to the anode of the second diode D2, and the second end of the third inductor L3 is connected to the anode of the third diode D3; the cathode of the first diode D1, the cathode of the second diode D2, and the cathode of the third diode D3 are all connected to the negative electrode of the power supply Vin.

3. The multi-phase interleaved boost converter with soft switching according to claim 1, characterized in that: The first diode D1, the second diode D2 and the third diode D3 are all connected to the negative electrode of the power supply Vin through the capacitor C0, the cathodes of the first diode D1, the second diode D2 and the third diode D3 are all connected to the first end of the load resistor R0, and the second end of the load resistor R0 is connected to the negative electrode of the power supply Vin.

4. The multi-phase interleaved boost converter with soft switching according to claim 1, characterized in that: The first diode D1, the second diode D2 and the third diode D3 are also connected to a capacitor C0, the cathodes of the first diode D1, the second diode D2 and the third diode D3 are all connected to the first end of the capacitor C0, and the second end of the capacitor C0 is connected to the negative electrode of the power supply Vin.

5. The multi-phase interleaved boost converter with soft switching according to claim 1, characterized in that: The first switch tube S1 and the second switch tube S2 are both Infineon IPP60R099C6 switch tubes.

6. The multi-phase interleaved boost converter with soft switching according to claim 1, characterized in that: The first resonant inductor Lr1 is a Coilcraft SER2010-102ML inductor.

7. The multi-phase interleaved boost converter with soft switching according to claim 1, characterized in that: The first resonant capacitor Cr1 and the second resonant capacitor Cr2 are both Kemet C322C104K1R5TA capacitors.

8. A method for using a multi-phase interleaved boost converter with soft switching as claimed in any one of claims 1 to 7, characterized in that: The following steps are involved: At the beginning of the working cycle, the first switch tube S1 and the second switch tube S2 are operated simultaneously; At the end of the working cycle, the first switch tube S1 and the second switch tube S2 are operated simultaneously again.

9. An active disturbance rejection control system, characterized in that: A multi-phase interleaved boost converter for controlling a soft switch according to any one of claims 1 to 7, comprising: A tracking differentiator, used for inputting a voltage Vin, and outputting a tracking signal voltage V1 and a differential signal voltage V2; A first subtractor, used for comparing the input tracking signal voltage V1 with the tracking signal result z1 of the extended state observer, and outputting a first difference value e1; A second subtractor, used for comparing the input differential signal voltage V2 with the differential signal result z2 of the extended state observer, and outputting a second difference value e2; A linear feedback controller, used to input a first difference e1 and a second difference e2, and output a correction voltage u0; A disturbance compensator, which is used to input a correction voltage u0 and an output result of the second multiplier, and output a compensation voltage u1; A first multiplier, used for calculating the product of the system gain bo and the compensation voltage u1; a second multiplier, used for calculating the product of the inverse of the system gain bo and the total disturbance value of the first extended state observer; The third subtractor is used to input the compensation voltage u1 and the current i of the multi-phase interleaved boost converter of the soft switch DC , output the third difference; The Pi controller is used to input the third difference e3 and output the duty cycle to the first switch tube S1 and the second switch tube S2 of the multi-phase interleaved boost converter of the soft switch; The first extended state observer is used to input the system gain bo and the voltage U of the soft-switched multi-phase interleaved boost converter DC The outputs are the estimated value Z1 of the tracking signal voltage V1 and the estimated value Z2 of the differential signal voltage V2.

10. A second-order linear active disturbance rejection control system, characterized in that: A multi-phase interleaved boost converter for controlling a soft switch according to any one of claims 1 to 7, comprising: Linear feedback rate calculator, used to input topological voltage reference Uref, system first output differential term z11, system second output differential term z21, and output correction voltage u01; A subtractor for calculating the difference e between the correction voltage u01 and the estimated value z31 of the total disturbance x3; a third multiplier, used for calculating the product of the difference value e and the inverse of the system gain b01, to obtain an input voltage U of a controller of a power supply Vin of the multi-phase interleaved boost converter for the soft switch; a fourth multiplier, used for calculating the product of the input voltage U of the controller and the inverse of the system gain b01; The second extended state observer is used to input the result of the fourth multiplier and the output voltage y of the soft-switching multi-phase interleaved boost converter; and output the system first output differential term z11, the system second output differential term z21 and the estimated value z3 of the total disturbance.

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