Direct current boost converter and charging system

Abstract

The application relates to a direct-current boost converter and a charging system; the direct-current boost converter comprises an input power supply, two power light pipes, two inductors, two energy storage capacitors, an output capacitor and three diodes; the application utilizes the inherent characteristics of an inductor-capacitor-diode network, combines the original characteristics of a traditional direct-current converter, realizes the promotion of the output voltage gain of the direct-current converter and the promotion of the working efficiency, and meanwhile, the circuit structure of the direct-current converter is simple, and the low-cost requirement is met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power electronics, in particular to a direct current boost converter and a charging system. BACKGROUND

[0002] The existing energy storage type charging pile is boosted in voltage by a direct current boost converter, and then the boosted voltage is applied to the charging end of the charging pile. However, the current direct current boost converter needs to have high gain under high duty cycle, which leads to high voltage stress of the direct current boost converter, and the working efficiency of the direct current boost converter is significantly reduced when working under high duty cycle.

[0003] At present, the converter topology is often used to solve the problems of high voltage stress and reduced efficiency with the increase of duty cycle. However, the converter topology is relatively complex in structure and control strategy, and cannot meet the requirements of high gain, high efficiency and low cost of the direct current boost converter at the same time. SUMMARY

[0004] Therefore, it is necessary to provide a direct current boost converter and a charging system which can meet the requirements of high gain, high efficiency and low cost of the direct current boost converter at the same time.

[0005] In a first aspect, the present application provides a direct current boost converter, comprising:

[0006] an input power supply V i ;

[0007] a first inductor L1, one end of the first inductor L1 being connected to the positive pole of the input power supply V i ;

[0008] a first power switch tube S1, the drain of the first power switch tube S1 being connected to the other end of the first inductor L1;

[0009] a first diode D1, the anode of the first diode D1 being connected to the other end of the first inductor L1 and the drain of the first power switch tube S1 respectively;

[0010] a second diode D2, the anode of the second diode D2 being connected to the source of the first power switch tube S1, and the cathode of the second diode D2 being connected to the negative pole of the input power supply V i ;

[0011] a first capacitor C1, one end of the first capacitor C1 being connected to the source of the first power switch tube S1 and the anode of the second diode D2 respectively, and the other end of the first capacitor C1 being connected to the cathode of the first diode D1;

[0012] A second capacitor C2 has one end connected to the other end of the first inductor L1, the drain of the first power switch S1 and the anode of the first diode D1, respectively.

[0013] A second inductor L2 has one end connected to the cathode of the first diode D1 and the other end of the first capacitor C1, respectively, and the other end of the second inductor L2 is connected to the other end of the second capacitor C2.

[0014] A second power switch S2 has the drain connected to the cathode of the first diode D1, the other end of the first capacitor C1 and one end of the second inductor L2, respectively, and the source connected to the cathode of the second diode D2 and the negative pole of the input power source V i , respectively.

[0015] A third diode D3 has the anode connected to the other end of the second capacitor C2 and the other end of the second inductor L2, respectively, and the cathode used for connecting the charging end of the charging pile.

[0016] An output capacitor C0 has one end connected to the source of the second power switch S2, the cathode of the second diode D2 and the negative pole of the input power source V i , respectively, and the other end connected between the cathode of the third diode D3 and the charging end of the charging pile.

[0017] In one of the embodiments, the DC boost converter sequentially goes through the first working mode, the second working mode and the third working mode in one switching cycle.

[0018] In one of the embodiments, when the DC boost converter is in the first working mode, the first power switch S1 and the second power switch S2 are turned on, and the first diode D1, the second diode D2 and the third diode D3 are all turned off.

[0019] In one of the embodiments, in the first working mode, the electrical parameter relationship is as follows:

[0020] V L1 =V i +V C1

[0021] V L2 =V C1 -V C2

[0022] Wherein, V i represents the voltage of the input power source; V L1 represents the voltage across the first inductor L1 in the first working mode; V L2 represents the voltage across the second inductor L2 in the first working mode; VC1 represents the voltage across the first capacitor C1 in the first operating mode; V C2 represents the voltage across the second capacitor C2 in the first operating mode.

[0023] In one embodiment, when the DC boost converter is in the second operating mode, the first power switch S1 and the second power switch S2 are turned off, the first diode D1 and the second diode D2 are turned on, and the third diode D3 is turned off.

[0024] In one embodiment, in the second operating mode, the electrical parameter relationship is as follows:

[0025] V L1 =V i -V C1

[0026] V L2 = -V C2

[0027] wherein V i represents the voltage of the input power supply; V L1 represents the voltage across the first inductor L1 in the second operating mode; V L2 represents the voltage across the second inductor L2 in the second operating mode; V C1 represents the voltage across the first capacitor C1 in the second operating mode; V C2 represents the voltage across the second capacitor C2 in the second operating mode.

[0028] In one embodiment, when the DC boost converter is in the third operating mode, the first power switch S1 and the second power switch S2 are turned off, the first diode D1, the second diode D2, and the third diode D3 are turned on.

[0029] In one embodiment, in the third operating mode, the electrical parameter relationship is as follows:

[0030] V L1 =V i -V C1

[0031] V L2 =V C1 –V0

[0032] wherein V i represents the voltage of the input power supply; V L1 represents the voltage across the first inductor L1 in the third operating mode; V L2 represents the voltage across the second inductor L2 in the third operating mode; V C1V1 represents the voltage of the first capacitor C1 at both ends in the third working mode; V0 represents the voltage at both ends of the charging pile.

[0033] In one embodiment, the calculation formula of the voltage gain G of the DC boost converter is as follows:

[0034]

[0035] V0 represents the voltage at both ends of the charging pile; D is the duty ratio of the first power switch S1 and the second power switch S2. i V0 represents the voltage at both ends of the charging pile; D is the duty ratio of the first power switch S1 and the second power switch S2.

[0036] In a second aspect, the application also provides a charging system, comprising a control module, a driving module connected to the control module, and a DC boost converter as described above connected to the driving module; wherein:

[0037] The driving module is respectively connected to the gate of the first power switch S1 and the gate of the second power switch S2, and the control module is used to connect the charging pile.

[0038] The DC boost converter and the charging system described above, by configuring the input power supply, two power switches, two inductors, two energy storage capacitors, one output capacitor and three diodes in the DC boost converter, make the DC boost converter provided by the application compared with the traditional converter, by using a relatively simple circuit topology, the voltage gain and the working efficiency can be improved, and the low cost requirement is met. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the application or the related art, the drawings needed to be used in the description of the embodiments of the application or the related art will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and those skilled in the art can also obtain other related drawings according to these drawings without creative labor.

[0040] Figure 1 It is a structure schematic diagram of the DC boost converter in one embodiment;

[0041] Figure 2 It is a current schematic diagram of the DC boost converter in the first working mode in one embodiment;

[0042] Figure 3 It is a current schematic diagram of the DC boost converter in the second working mode in one embodiment;

[0043] Figure 4 It is a current schematic diagram of the DC boost converter in the third working mode in one embodiment;

[0044] Figure 5 is a schematic structural diagram of a charging system in one embodiment;

[0045] Figure 6 Schematic diagram of current / voltage waveforms of some components in a charging system in one embodiment. DETAILED DESCRIPTION

[0046] To facilitate understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The accompanying drawings provide embodiments of the present application. However, the present application may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0048] It will be understood that the terms "first," "second," etc., used herein may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of this application, a first capacitor may be referred to as a second capacitor, and similarly, a second capacitor may be referred to as a first capacitor. Both a first capacitor and a second capacitor are capacitors, but they are not the same capacitor.

[0049] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if there is transmission of electrical signals or data between the connected circuits, modules, units, etc.

[0050] It is understood that “at least one” refers to one or more, “a plurality” refers to two or more, and “at least a portion of an element” refers to a portion or all of an element.

[0051] As used herein, the singular forms "a," "an," and "the" may also include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include," "comprising," "having," and the like specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Furthermore, the term "and / or" as used in this specification includes any and all combinations of the relevant listed items.

[0052] The direct-current boost converter provided by the embodiment of the present application meets high voltage gain and high working efficiency, maximally reduces complexity of the converter circuit topology, and reduces difficulty of control and adjustment of the direct-current boost converter. Compared with the prior art, the direct-current boost converter provided by the embodiment of the present application has the following advantages: simple structure, convenient control, high working efficiency, and large voltage gain.

[0053] In one exemplary embodiment, as shown in Figure 1 , a direct-current boost converter is provided, comprising:

[0054] an input power supply V i ;

[0055] a first inductor L1, one end of the first inductor L1 being connected to a positive pole of the input power supply V i ;

[0056] a first power switch S1, a drain of the first power switch S1 being connected to the other end of the first inductor L1;

[0057] a first diode D1, an anode of the first diode D1 being connected to the other end of the first inductor L1 and the drain of the first power switch S1 respectively;

[0058] a second diode D2, an anode of the second diode D2 being connected to a source of the first power switch S1, and a cathode of the second diode D2 being connected to a negative pole of the input power supply V i ;

[0059] a first capacitor C1, one end of the first capacitor C1 being connected to the source of the first power switch S1 and the anode of the second diode D2 respectively, and the other end of the first capacitor C1 being connected to a cathode of the first diode D1;

[0060] a second capacitor C2, one end of the second capacitor C2 being connected to the other end of the first inductor L1, the drain of the first power switch S1, and the anode of the first diode D1 respectively;

[0061] a second inductor L2, one end of the second inductor L2 being connected to the cathode of the first diode D1 and the other end of the first capacitor C1 respectively, and the other end of the second inductor L2 being connected to the other end of the second capacitor C2;

[0062] a second power switch S2, a drain of the second power switch S2 being connected to the cathode of the first diode D1, the other end of the first capacitor C1, and one end of the second inductor L2 respectively, and a source of the second power switch S2 being connected to the cathode of the second diode D2 and the negative pole of the input power supply V i ; and

[0063] ​The anode of the third diode D3 is connected to the other end of the second capacitor C2 and the other end of the second inductor L2 respectively, and the cathode of the third diode D3 is used to connect the charging end of the charging pile;

[0064] The one end of the output capacitor C0 is connected to the source of the second power switch S2, the cathode of the second diode D2 and the negative electrode of the input power supply V i , and the other end of the output capacitor C0 is connected between the cathode of the third diode D3 and the charging end of the charging pile.

[0065] The input power supply V i represents a device for providing electric energy, for example: an energy storage battery, and the size of the electric energy provided by the input power supply V i can be set according to actual conditions, which is not limited in the embodiment of the present application; the first capacitor C1 and the second capacitor C2 can be used to store electric energy.

[0066] Specifically, the DC boost converter includes an input power supply V i , a first power switch S1, a second power switch S2, a first inductor L1, a second inductor L2, a first capacitor C1, a second capacitor C2, an output capacitor C0, a first diode D1, a second diode D2 and a third diode D3. By adjusting the working state of the first power switch S1 and the second power switch S2, the DC boost converter provided by the present application can realize the increase of voltage gain and working efficiency by using a relatively simple circuit topology, while meeting the requirement of low cost. Compared with the traditional converter, the DC boost converter provided by the present application can meet the requirements of high gain, high efficiency and low cost at the same time.

[0067] In one of the embodiments, the DC boost converter sequentially enters a first working mode, a second working mode and a third working mode in a switching cycle.

[0068] Specifically, by setting the switching cycle T s and the duty cycle D of the first power switch S1 and the second power switch S2, the duration of each of the three working modes can be obtained, wherein the duration of the first working mode is DT s , the duration of the second working mode is DT s , and the duration of the third working mode is (1-2D)T s .

[0069] For example, the start time of a switching cycle can be defined as time t0, the time period between time t0 and time t1 is used as the time period for the first working mode, the time period between time t1 and time t2 is used as the time period for the second working mode, and the time period between time t2 and time t3 is used as the time period for the third working mode. Time t3 is both the end time of a switching cycle and the start time of the next switching cycle.

[0070] It should be noted that the switching period T of the first power switch tube S1 and the second power switch tube S2 is s The duty cycle D can be set according to actual conditions and is not limited in the embodiments of the present application.

[0071] In one embodiment, Figure 2 As shown, when the DC boost converter is in the first working mode, the first power switch tube S1 and the second power switch tube S2 are turned on, and the first diode D, the second diode D2 and the third diode D3 are all turned off.

[0072] Specifically, when the DC boost converter is in the first operating mode, that is, between time t0 and time t1, as shown in FIG. Figure 2 As shown, the first power switch tube S1 and the second power switch tube S2 are turned on, the first diode D2 and the third diode D3 are all turned off, and the input power supply V i The first capacitor C1 and the first inductor L1 are charged, the first capacitor C1 also charges the second capacitor C2 and the second inductor L2, and the output capacitor C0 supplies power to the charging end of the charging pile.

[0073] It should be noted that if Figure 2 As shown, the dotted line represents disconnection, the solid line represents flow, and the direction of the arrow is the actual current direction.

[0074] In one embodiment, in the first working mode, the electrical parameter relationship is as follows:

[0075] V L1 =V i +V C1

[0076] V L2 =V C1 -V C2

[0077] Among them, V i Indicates the voltage of the input power supply; V L1 represents the voltage across the first inductor L1 in the first operating mode; V L2 represents the voltage across the second inductor L2 in the first operating mode; V C1V C2 represents the voltage across the second capacitor C2 in the first operating mode.

[0078] In one embodiment, as shown in FIG. 3, when the DC-boost converter is in the second operating mode, the first power switch S1 and the second power switch S2 are turned off, the first diode D1 and the second diode D2 are turned on, and the third diode D3 is turned off. Figure 3

[0079] Specifically, when the DC-boost converter is in the second operating mode, i.e., between t1 and t2, as shown in FIG. 4, the first power switch S1 and the second power switch S2 are turned off, the first diode D1 and the second diode D2 are turned on, and the third diode D3 is turned off. At this time, the input power V i and the first inductor L1 charge the first capacitor C1, the second inductor L2 charges the second capacitor C2, and the output capacitor C0 supplies power to the charging end of the charging pile. Figure 3

[0080] It should be noted that, as shown in FIG. 3, the dashed line represents disconnection, the solid line represents conduction, and the arrow direction is the actual current direction. Figure 3

[0081] In one embodiment, in the second operating mode, the electrical parameter relationship is as follows:

[0082] V L1 = V i -V C1

[0083] V L2 = -V C2

[0084] wherein V i represents the voltage of the input power; V L1 represents the voltage across the first inductor L1 in the second operating mode; V L2 represents the voltage across the second inductor L2 in the second operating mode; V C1 represents the voltage across the first capacitor C1 in the second operating mode; V C2 represents the voltage across the second capacitor C2 in the second operating mode.

[0085] In one embodiment, as shown in FIG. 5, when the DC-boost converter is in the third operating mode, the first power switch S1 and the second power switch S2 are turned off, the first diode D1, the second diode D2, and the third diode D3 are turned on. Figure 4

[0086] ​​​​Specifically, when the DC boost converter is in the third working mode, i.e. between t2 and t3, as shown in FIG. 3, the first power switch S1 and the second power switch S2 are off, and the first diode D1, the second diode D2 and the third diode D3 are all on. At this time, the input power V Figure 4 charges the first capacitor C1, and the second inductor L2 and the second capacitor C2 charge the output capacitor C0 and the charging pile. i charges the first capacitor C1, and the second inductor L2 and the second capacitor C2 charge the output capacitor C0 and the charging pile.

[0087] It should be noted that at t1, the first power switch S1 and the second power switch S2 are off, at this time the current on the first inductor L1 and the second inductor L2 will not change abruptly, the first diode D1 is on, and the voltage on the first capacitor C1 and the second capacitor C2 is not enough to make the third diode D3 conduct, so the current on the first capacitor C1 forms a loop through the second diode D2. At t2, the voltage on the first capacitor C1 and the second capacitor C2 is enough to make the third diode D3 conduct, so at t3, the first diode D1, the second diode D2 and the third diode D3 are all on.

[0088] As shown in FIG. 3, the dashed line represents disconnection, the solid line represents conduction, and the arrow direction is the actual current direction. Figure 4

[0089] In one embodiment, in the third working mode, the electrical parameter relationship is as follows:

[0090] V L1 = V i -V C1

[0091] V L2 = V C1 -V0

[0092] wherein V i represents the voltage of the input power; V L1 represents the voltage across the first inductor L1 in the third working mode; V L2 represents the voltage across the second inductor L2 in the third working mode; V C1 represents the voltage across the first capacitor C1 in the third working mode; and V0 represents the voltage across the charging pile.

[0093] In one embodiment, the calculation formula of the voltage gain G of the DC boost converter is as follows:

[0094]

[0095] wherein V i ​represents the voltage of the input power supply; V0 represents the voltage across the charging pile; D is the duty ratio of the first power switch S1 and the second power switch S2.

[0096] Specifically, the switching period of the first power switch S1 and the second power switch S2 is set as T s , the duty ratio is D, the duration of the first working mode is DT s , the duration of the second working mode is DT s , and the duration of the third working mode is (1-2D)T s According to the inductance-voltage-second balance characteristics, the following can be obtained:

[0097]

[0098]

[0099]

[0100] wherein, VC1 represents the voltage across the first capacitor C1; VC2 represents the voltage across the second capacitor C2; V i represents the voltage of the input power supply; V0 represents the voltage across the charging pile (output voltage).

[0101] By combining the above formulas, the calculation formula of the voltage gain can be obtained, wherein, by comparison, when the duty ratio D changes in the range of 0 to 0.49, the voltage gain of the traditional direct current converter can only change in the range of 0 to 2, that is, the output voltage (voltage across the charging pile) can only be 0 to 2 times the input voltage (voltage of the input power supply), while the voltage gain of the direct current booster converter provided by the present application can change in the range of 0 to 74.5, and the output voltage can be up to 37.25 times the input voltage, greatly expanding the gain of the traditional direct current converter.

[0102] In the above direct current booster converter, by configuring an input power supply, two power switch tubes, two inductors, three capacitors and three diodes in the direct current booster converter, and by using the inherent characteristics of the inductor-capacitor-diode network, when the first power switch S1 and the second power switch S2 are turned on, the input power supply V i and the first capacitor C1 charge the first inductor L1, the first capacitor C1 also charges the second capacitor C2 and the second inductor L2, and the output capacitor C0 supplies power to the charging pile; when the first power switch S1 and the second power switch S2 are turned off, the input power supply V i and the first inductor L1 charge the first capacitor C1, the second inductor L2 charges the second capacitor C2, and the output capacitor C0 supplies power to the charging pile; when the voltage on the first capacitor C1 and the second capacitor C2 is sufficient to turn on the third diode D3, the input power supply V iThe first inductor L1 charges the first capacitor C1, the second inductor L2 and the second capacitor C2 charge the output capacitor C0 and the charging pile, so as to raise the output voltage, realize the expansion of the converter output voltage gain combined with the original characteristics of the traditional DC converter, improve the working efficiency, and realize the improvement of the voltage gain and the working efficiency by using a relatively simple circuit topology, and meet the low cost requirement.

[0103] In an exemplary embodiment, as shown in Figure 5 , a charging system is provided, comprising a control module, a driving module connected to the control module, and a DC boost converter as described above connected to the driving module; wherein:

[0104] The driving module is respectively connected to the gate of the first power switch tube S1 and the gate of the second power switch tube S2, and the control module is used for connecting the charging pile.

[0105] Specifically, the control module can control the driving module to adjust the working state of the first power switch tube S1 and the second power switch tube S2 at the corresponding time, and the feedback amount received by the current feedback and the voltage feedback is respectively Figure 5 The current I0 (output current) flowing into the charging end of the charging pile and the voltage V0 (output voltage) flowing into the charging end of the charging pile.

[0106] It should be noted that the circuit structure of the DC boost converter is relatively simple, occupies a smaller position in the charging system, that is, the overall volume of the charging system is smaller, and has the characteristics of portability.

[0107] Exemplarily, in order to facilitate the understanding of those skilled in the art, the voltage / current in the charging system will be described below in combination with a specific example, as shown in Figure 6 , as shown in Figure 6 Exemplarily, the voltage / current waveform diagram of each device in the charging system in a switching cycle is given.

[0108] As shown in Figure 6 , V G represents the driving signal of the first power switch tube S1 and the second power switch tube S2; V L1 , i L1 represent the voltage and current between the first inductor L1 (the solid line is the voltage and the dashed line is the current); V L2 , i L2 represent the voltage and current between the second inductor L2 (the solid line is the voltage and the dashed line is the current); V i represents the voltage of the input power supply; V C1 represents the voltage between the first capacitor C1; V C2 represents the voltage between the second capacitor C2; V D1Voltage across the first diode D1; V D2 Voltage across the second diode D2; V D3 Voltage across the third diode D3; V S1 Voltage across the first power switch S1 drain and source; V S2 Voltage across the second power switch S2 drain and source; i C0 Current through the output capacitor Co; Switching period of the first power switch S1 and the second power switch S2 s And duty cycle D.

[0109] In the description of the specification, the description referring to the terms "some embodiments", "other embodiments" and the like is intended to mean that the particular feature, structure, material, or characteristic being described in connection with the embodiment or example is included in at least one embodiment or example of the application. The appearances of the above-described terms in various places in the specification are not necessarily intended to refer to the same embodiment or example.

[0110] Any of the technical features of the above-described embodiments can be combined, and for the sake of brevity, not all possible combinations are described in the above description. However, any combination of the technical features is considered to be within the scope of the present application.

[0111] The above-described embodiments are merely some embodiments of the present application, and the description is specific and detailed, but should not be construed as limiting the scope of the present application. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the scope of the present application. Therefore, the scope of the present application should be subject to the appended claims.

Claims

1. A dc-dc boost converter, characterized by, Comprise: Input power supply V i ; a first inductor L1, one end of the first inductor L1 being connected with a positive electrode of the input power supply V i ; a first power switch S1, the drain of the first power switch S1 is connected to the other end of the first inductor L1; a first diode D1, the anode of the first diode D1 is connected to the other end of the first inductor L1 and the drain of the first power switch S1 respectively; a second diode D2, an anode of the second diode D2 being connected to a source of the first power switch S1, a cathode of the second diode D2 being connected to a negative pole of the input power supply V i ; a first capacitor C1, one end of the first capacitor C1 is connected to the source of the first power switch S1 and the anode of the second diode D2 respectively, the other end of the first capacitor C1 is connected to the cathode of the first diode D1; a second capacitor C2, one end of the second capacitor C2 is connected to the other end of the first inductor L1, the drain of the first power switch S1 and the anode of the first diode D1 respectively; a second inductor L2, one end of the second inductor L2 is connected to the cathode of the first diode D1 and the other end of the first capacitor C1 respectively, the other end of the second inductor L2 is connected to the other end of the second capacitor C2; A second power switch tube S2, the drain of the second power switch tube S2 is connected to the cathode of the first diode D1, the other end of the first capacitor C1 and one end of the second inductor L2 respectively, the source of the second power switch tube S2 is connected to the cathode of the second diode D2 and the negative pole of the input power supply V i respectively. a third diode D3, the anode of the third diode D3 is connected to the other end of the second capacitor C2 and the other end of the second inductor L2 respectively, the cathode of the third diode D3 is used for connecting the charging end of the charging pile; An output capacitor C0 has one end connected to the source of the second power switch S2, the cathode of the second diode D2 and the negative pole of the input power source V i respectively, and the other end connected between the cathode of the third diode D3 and the charging end of the charging pile.

2. The boost converter according to claim 1, characterized in that The DC boost converter sequentially is in the first working mode, the second working mode and the third working mode in a switching cycle.

3. The boost converter according to claim 2, characterized in that When the DC boost converter is in the first working mode, the first power switch S1 and the second power switch S2 are turned on, and the first diode D1, the second diode D2 and the third diode D3 are all turned off.

4. The boost converter of claim 3, wherein, In the first working mode, the electrical parameter relationship is as follows: V L1 =V i +V C1 V L2 =V C1 -V C2 Wherein, the V i represents the voltage of the input power supply; the V L1 represents the voltage across the first inductor L1 in the first operating mode; the V L2 represents the voltage across the second inductor L2 in the first operating mode; the V C1 represents the voltage across the first capacitor C1 in the first operating mode; the V C2 represents the voltage across the second capacitor C2 in the first operating mode.

5. The boost converter of claim 2, wherein, When the DC boost converter is in the second working mode, the first power switch S1 and the second power switch S2 are turned off, and the first diode D1 and the second diode D2 are both turned on, and the third diode D3 is turned off.

6. The boost converter of claim 5, wherein, In the second working mode, the electrical parameter relationship is as follows: V L1 = V i -V C1 V L2 = -V C2 wherein the V i represents the voltage of the input power source; the V L1 represents the voltage across the first inductor L1 in the second operating mode; the V L2 represents the voltage across the second inductor L2 in the second operating mode; the V C1 represents the voltage across the first capacitor C1 in the second operating mode; the V C2 represents the voltage across the second capacitor C2 in the second operating mode.

7. The DC boost converter according to claim 2, wherein: When the DC boost converter is in the third working mode, the first power switch S1 and the second power switch S2 are turned off, and the first diode D1, the second diode D2 and the third diode D3 are all turned on.

8. The boost converter of claim 7, wherein, In the third working mode, the electrical parameter relationship is as follows: V L1 =V i -V C1 V L2 =V C1 –V0 Wherein, the V i represents the voltage of the input power supply; the V L1 represents the voltage across the first inductor L1 in the third operating mode; the V L2 represents the voltage across the second inductor L2 in the third operating mode; the V C1 represents the voltage across the first capacitor C1 in the third operating mode; and the V0 represents the voltage across the charging pile.

9. The boost converter of claim 1, wherein, The calculation formula of the voltage gain G of the DC boost converter is as follows: Wherein, the V i The V represents the voltage of the input power supply; the V0 represents the voltage across the charging pile; and the D is the duty cycle of the first power switch tube S1 and the second power switch tube S2.

10. A charging system, characterized by The DC boost converter comprises a control module, a driving module connected to the control module, and the DC boost converter according to any one of claims 1 to 9 connected to the driving module; wherein: The driving module is connected to the gate of the first power switch S1 and the gate of the second power switch S2 respectively, and the control module is used for connecting the charging pile.

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