Electric vehicle charging pile device and control method

Abstract

The present invention discloses an electric vehicle charging pile device and a control method. The electric vehicle charging pile device includes a diode rectifier bridge module, a symmetrical boost bridge module, an output module and an AC power supply module. One end of the diode rectifier bridge module is connected to the AC power supply module, and the other end of the diode rectifier bridge module is connected to one end of the symmetrical boost bridge module. The diode rectifier bridge module is used to obtain the AC power output by the AC power supply module and convert the AC power into a DC power supply. The other end of the symmetrical boost bridge module is connected to the output module, and the symmetrical boost bridge module is used to boost the DC power supply to generate a corresponding boost voltage. The output module is used to determine the output voltage corresponding to the electric vehicle charging pile device based on the boost voltage. By improving the topological structure corresponding to the electric vehicle charging pile device, the symmetrical boost bridge module used can realize power factor correction and has the advantage of high voltage gain.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicle charging piles, and in particular to an electric vehicle charging pile device and a control method. Background Art

[0002] As people's living standards continue to improve, the number of families purchasing private cars is also increasing. Since automobile exhaust is difficult to deal with, the large increase in the number of cars has caused serious environmental pollution problems, which has continuously threatened people's health. Nowadays, new energy technologies are developing rapidly, electric vehicles are favored by many people, and their scope of use is also constantly expanding. Electric vehicles have no exhaust emissions, which is beneficial to maintaining the environment.

[0003] However, electric vehicles need to be charged regularly. In order to meet their charging needs, the use of electric vehicle charging pile devices is essential. However, the electric vehicle charging pile devices used today use traditional boost circuits. When facing industrial needs in specific occasions, traditional boost circuits will have insufficient gain. Existing electric vehicle charging pile devices meet higher gain requirements by cascading multiple-stage boost circuits.

[0004] However, this method requires more devices. As the number of devices increases, the loss in the circuit also increases, and the corresponding material cost also increases. Moreover, the more switching devices are used, the higher the failure rate will be, resulting in poor stability of the constructed electric vehicle charging pile device. Summary of the invention

[0005] The present invention provides an electric vehicle charging pile device and a control method, which solves the technical problem that the high-gain circuit corresponding to the existing electric vehicle charging pile device requires more devices, and as the number of devices increases, the loss in the circuit gradually increases, and the corresponding material cost also increases. In addition, the more switching devices are used, the higher the failure rate will be, resulting in poor stability of the constructed electric vehicle charging pile device.

[0006] The present invention provides an electric vehicle charging pile device, comprising: a diode rectifier bridge module, a symmetrical boost bridge module, an output module and an AC power supply module;

[0007] One end of the diode rectifier bridge module is connected to the AC power supply module;

[0008] The other end of the diode rectifier bridge module is connected to one end of the symmetrical boost bridge module, and the diode rectifier bridge module is used to obtain the AC power output by the AC power supply module and convert the AC power into a DC power supply;

[0009] The other end of the symmetrical boost bridge module is connected to the output module, and the symmetrical boost bridge module is used to boost the DC power supply to generate a corresponding boost voltage;

[0010] The output module is used to determine the output voltage corresponding to the electric vehicle charging pile device based on the boost voltage.

[0011] Optionally, the diode rectifier bridge module includes a first diode, a second diode, a third diode and a fourth diode;

[0012] One end of the AC power supply module and one end of the third diode are both connected to one end of the first diode;

[0013] One end of the second diode and one end of the symmetrical boost bridge module are both connected to the other end of the first diode;

[0014] The other end of the AC power supply module and one end of the fourth diode are both connected to the other end of the second diode;

[0015] The other end of the third diode and the other end of the symmetrical boost bridge module are both connected to the other end of the fourth diode.

[0016] Optionally, the symmetrical boost bridge module includes a first boost bridge and a second boost bridge;

[0017] One end of the first boost bridge is connected to one end of the second boost bridge;

[0018] One end of the diode rectifier bridge module and one end of the output module are both connected to the other end of the first boost bridge;

[0019] The other end of the diode rectifier bridge module and the other end of the output module are both connected to the other end of the second boost bridge.

[0020] Optionally, the first boost bridge includes a first inductor and a first switch tube; the second boost bridge includes a second inductor and a second switch tube;

[0021] One end of the diode rectifier bridge module and one end of the first switch tube are both connected to one end of the first inductor;

[0022] One end of the second switch tube and one end of the output module are both connected to the other end of the first inductor;

[0023] The other end of the first switch tube and the other end of the output module are both connected to one end of the second inductor;

[0024] The other end of the second switch tube and the other end of the diode rectifier bridge module are both connected to the other end of the second inductor.

[0025] Optionally, the output module includes an output diode, an output capacitor and an output load;

[0026] One end of the first inductor and one end of the second switch tube are both connected to one end of the output diode;

[0027] One end of the output load and one end of the output capacitor are both connected to the other end of the output diode;

[0028] The other end of the output load, one end of the first switch and one end of the second inductor are all connected to the other end of the output capacitor.

[0029] Optionally, a DC side gain calculation module is also included;

[0030] The gain calculation module is used to calculate the DC side gain corresponding to the electric vehicle charging pile device according to the working states corresponding to the first switch and the second switch.

[0031] Optionally, the DC side gain calculation module includes an inductance volt-second determination module, a DC side gain formula construction module and a DC side gain calculation submodule;

[0032] The inductor volt-second determination module is used to determine the inductor volt-second corresponding to the working state according to the working states and corresponding inductor voltages corresponding to the first switch and the second switch;

[0033] The DC side gain formula construction module is used to construct a DC side gain formula corresponding to the electric vehicle charging pile device based on the inductor volt-seconds and the inductor voltage;

[0034] The DC side gain calculation submodule is used to substitute the input voltage corresponding to the electric vehicle charging pile device into the DC side gain formula to calculate the DC side gain corresponding to the electric vehicle charging pile device.

[0035] Optionally, the working state includes a first working state and a second working state; the inductance volt-second determination module may perform the following steps:

[0036] When the first switch and the second switch are in the first working state, obtaining a first inductor voltage corresponding to the electric vehicle charging device;

[0037] Determining a first inductor volt-second corresponding to the first working state based on the first inductor voltage and a preset duty cycle;

[0038] When the first switch and the second switch are in the second working state, obtaining a second inductor voltage corresponding to the electric vehicle charging device;

[0039] A second inductor volt-second corresponding to the second working state is determined based on the second inductor voltage and the preset duty cycle.

[0040] Optionally, it also includes a working mode generation module;

[0041] The working mode generation module is used to divide the industrial frequency working cycle corresponding to the electric vehicle charging pile device based on a pulse width modulation strategy to generate the working mode corresponding to the electric vehicle charging pile device.

[0042] A second aspect of the present invention provides a control method for an electric vehicle charging pile device, wherein the electric vehicle charging pile device includes a diode rectifier bridge module, a symmetrical boost bridge module, an output module and an AC power supply module; the method includes:

[0043] Acquire the AC power output by the AC power supply module through the diode rectifier bridge module, and convert the AC power into a DC power supply;

[0044] Boosting the DC power supply by using the symmetrical boost bridge module to generate a corresponding boost voltage;

[0045] The output module is used to determine the output voltage corresponding to the electric vehicle charging pile device based on the boost voltage.

[0046] It can be seen from the above technical solutions that the present invention has the following advantages:

[0047] The present invention includes a diode rectifier bridge module, a symmetrical boost bridge module, an output module and an AC power supply module through an electric vehicle charging pile device. One end of the diode rectifier bridge module is connected to the AC power supply module, and the other end of the diode rectifier bridge module is connected to one end of the symmetrical boost bridge module. The diode rectifier bridge module is used to obtain the AC power output by the AC power supply module and convert the AC power into a DC power supply. The other end of the symmetrical boost bridge module is connected to the output module, and the symmetrical boost bridge module is used to boost based on the DC power supply to generate a corresponding boost voltage. The output module is used to determine the output voltage corresponding to the electric vehicle charging pile device based on the boost voltage. The problem that the high-gain circuit corresponding to the existing electric vehicle charging pile device requires more devices, and as the number of devices increases, the loss in the circuit also gradually increases, and the corresponding material cost also increases. Moreover, the more switching devices are used, the greater the failure rate, resulting in the poor stability of the constructed electric vehicle charging pile device. By improving the topological structure corresponding to the electric vehicle charging pile device, the symmetrical boost bridge module used can realize power factor correction, has the advantage of high voltage gain, and improves the power density by using fewer power tubes, thereby improving the charging efficiency of the electric vehicle charging pile device. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0049] Figure 1 A structural block diagram of an electric vehicle charging pile device provided by an embodiment of the present invention;

[0050] Figure 2 A main topological structure diagram corresponding to an electric vehicle charging pile device provided in an embodiment of the present invention;

[0051] Figure 3 A circuit schematic diagram corresponding to a working mode of an electric vehicle charging pile device provided by an embodiment of the present invention;

[0052] Figure 4 A circuit schematic diagram corresponding to the second working mode of an electric vehicle charging pile device provided by an embodiment of the present invention;

[0053] Figure 5 A circuit schematic diagram corresponding to three working modes of an electric vehicle charging pile device provided by an embodiment of the present invention;

[0054] Figure 6A circuit schematic diagram corresponding to the fourth working mode of an electric vehicle charging pile device provided by an embodiment of the present invention;

[0055] Figure 7 A flowchart of the steps of a control method applied to an electric vehicle charging pile device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0056] The embodiment of the present invention provides an electric vehicle charging pile device and a control method, which are used to solve the technical problem that the high-gain circuit corresponding to the existing electric vehicle charging pile device requires more devices. As the number of devices increases, the loss in the circuit gradually increases, and the corresponding material cost also increases. In addition, the more switching devices are used, the higher the failure rate will be, resulting in poor stability of the constructed electric vehicle charging pile device.

[0057] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, 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 embodiments described below 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 are within the scope of protection of the present invention.

[0058] See also Figure 1 , Figure 1 This is a structural block diagram of an electric vehicle charging pile device provided by an embodiment of the present invention.

[0059] The present invention provides an electric vehicle charging pile device, comprising: a diode rectifier bridge module 2, a symmetrical boost bridge module 3, an output module 4 and an AC power supply module 1; one end of the diode rectifier bridge module 2 is connected to the AC power supply module 1; the other end of the diode rectifier bridge module 2 is connected to one end of the symmetrical boost bridge module 3, the diode rectifier bridge module 2 is used to obtain the AC power output by the AC power supply module 1, and convert the AC power into a DC power supply; the other end of the symmetrical boost bridge module 3 is connected to the output module 4, the symmetrical boost bridge module 3 is used to boost based on the DC power supply to generate a corresponding boost voltage; the output module 4 is used to determine the corresponding output voltage of the electric vehicle charging pile device based on the boost voltage.

[0060] It should be noted that the AC power module 1 and the diode rectifier bridge module 2 are used to construct the front-stage rectifier circuit to convert the AC power into a DC power. The symmetrical boost bridge module 3 and the output module 4 are used to construct the back-stage circuit, which is based on the DC power supply to boost and generate the corresponding boost voltage, and based on the boost voltage, the corresponding output voltage of the electric vehicle charging pile device is determined to achieve the voltage high gain and power factor correction PFC function.

[0061] See also Figure 2 Figure 2 A main topological structure diagram corresponding to an electric vehicle charging pile device provided in an embodiment of the present invention.

[0062] The present invention provides an electric vehicle charging pile device, comprising: a diode rectifier bridge module 2, a symmetrical boost bridge module 3, an output module 4 and an AC power supply module 1.

[0063] The diode rectifier bridge module 2 includes a first diode D1, a second diode D2, a third diode D3 and a fourth diode D4; one end of the AC power supply module 1 and one end of the third diode D3 are both connected to one end of the first diode D1; one end of the second diode D2 and one end of the symmetrical boost bridge module 3 are both connected to the other end of the first diode D1; the other end of the AC power supply module 1 and one end of the fourth diode D4 are both connected to the other end of the second diode D2; the other end of the third diode D3 and the other end of the symmetrical boost bridge module 3 are both connected to the other end of the fourth diode D4.

[0064] The symmetrical boost bridge module 3 includes a first boost bridge and a second boost bridge; one end of the first boost bridge is connected to one end of the second boost bridge; one end of the diode rectifier bridge module and one end of the output module are both connected to the other end of the first boost bridge; the other end of the diode rectifier bridge module and the other end of the output module are both connected to the other end of the second boost bridge.

[0065] Furthermore, the first boost bridge includes a first inductor L1 and a first switch tube Q1; the second boost bridge includes a second inductor L2 and a second switch tube Q2; one end of the diode rectifier bridge module 2 and one end of the first switch tube Q1 are both connected to one end of the first inductor L1; one end of the second switch tube Q2 and one end of the output module 4 are both connected to the other end of the first inductor L1; the other end of the first switch tube Q1 and the other end of the output module 4 are both connected to one end of the second inductor L2; the other end of the second switch tube Q2 and the other end of the diode rectifier bridge module 2 are both connected to the other end of the second inductor L2.

[0066] The output module 4 includes an output diode D5, an output capacitor C1 and an output load R L One end of the first inductor L1 and one end of the second switch tube Q2 are connected to one end of the output diode D5; the output load R L One end of the output capacitor C1 and the other end of the output diode D5 are connected; the output load R L The other end of the output capacitor C1, one end of the first switch Q1 and one end of the second inductor L2 are all connected to the other end of the output capacitor C1.

[0067] In the embodiment of the present invention, Figure 2As shown, one end of the AC power supply module 1, i.e., the AC power supply AC, is connected to the anode of the first diode D1 and the cathode of the third diode D3, and the connection point thereof constitutes an end point a; the other end of the AC power supply AC is connected to the anode of the second diode D2 and the cathode of the fourth diode D4, and the connection point thereof constitutes an end point b; the anode of the output diode D5 is connected to one end of the first inductor L1 and the drain of the second switch tube Q2, and the cathode is connected to the positive electrode of the output capacitor C1, constituting an end point c; the other end of the first inductor L1 is connected to the cathode of the first diode D1, the second diode D2, and the drain of the first switch tube Q1; one end of the second inductor L2 is connected to the cathode of the output capacitor C1 and the source of the first switch tube Q1, constituting an end point d; the other end of the second inductor L2 is connected to the anode of the third diode D3, the fourth diode D4, and the source of the second switch tube Q2.

[0068] Furthermore, the electric vehicle charging pile device also includes a DC side gain calculation module; the gain calculation module is used to calculate the DC side gain corresponding to the electric vehicle charging pile device according to the working states corresponding to the first switch Q1 and the second switch Q2.

[0069] In the embodiment of the present invention, the first switch Q1 and the second switch Q2 are turned on and off at the same time. Based on the working states corresponding to the first switch Q1 and the second switch Q2, the corresponding duty cycle, inductor voltage and inductor volt-seconds are obtained, and the DC side gain corresponding to the electric vehicle charging pile device in the working state is calculated.

[0070] Furthermore, the DC side gain calculation module includes an inductor volt-second determination module, a DC side gain formula construction module and a DC side gain calculation submodule. The inductor volt-second determination module is used to determine the inductor volt-second corresponding to the working state according to the working state and the corresponding inductor voltage corresponding to the first switch Q1 and the second switch Q2. The DC side gain formula construction module is used to construct a DC side gain formula corresponding to the electric vehicle charging pile device based on the inductor volt-second and the inductor voltage. The DC side gain calculation submodule is used to substitute the input voltage corresponding to the electric vehicle charging pile device into the DC side gain formula to calculate the DC side gain corresponding to the electric vehicle charging pile device.

[0071] In the embodiment of the present invention, the inductor volt-second determination module is used to obtain the inductor volt-second corresponding to the current working state of the first switch Q1 and the second switch Q2, and the DC side gain formula construction module is used to construct the DC side gain formula corresponding to the electric vehicle charging pile device based on the inductor volt-second and the inductor voltage. The DC side gain calculation submodule substitutes the input voltage corresponding to the electric vehicle charging pile device into the DC side gain formula to calculate the DC side gain corresponding to the electric vehicle charging pile device.

[0072] Further, the working state includes a first working state and a second working state; the inductance volt-second determination module can perform the following steps:

[0073] When the first switch Q1 and the second switch Q2 are in the first working state, a first inductor voltage corresponding to the electric vehicle charging device is obtained; based on the first inductor voltage and a preset duty cycle, a first inductor volt-second corresponding to the first working state is determined; when the first switch Q1 and the second switch Q2 are in the second working state, a second inductor voltage corresponding to the electric vehicle charging device is obtained; based on the second inductor voltage and a preset duty cycle, a second inductor volt-second corresponding to the second working state is determined.

[0074] In the embodiment of the present invention, the first working state means that both the first switch Q1 and the second switch Q2 are turned on. The second working state means that both the first switch Q1 and the second switch Q2 are turned off. The first inductor voltage corresponding to the first working state of the first switch Q1 and the second switch Q2 is obtained, and the first inductor volt-second corresponding to the first working state is determined in combination with the corresponding duty cycle and time. The second inductor voltage corresponding to the second working state of the first switch Q1 and the second switch Q2 is obtained, and the second inductor volt-second corresponding to the second working state is determined in combination with the corresponding duty cycle and time. When the circuit works in a steady state, the first switch Q1 and the second switch Q2 are both turned on, and the inductor voltage is V in , the inductance volt-second is V in *D*T; the first switch Q1 and the second switch Q2 are both turned off, and the inductor voltage is (V o -V in ) / 2, the volt-second of the inductor is (V o -V in ) / 2*(1-D)*T. Since the circuit is working in steady state, there is an inductor volt-second balance, that is, V in *D*T=(V o -V in ) / 2*(1-D)*T. It can be inferred that the DC side PFC gain of the present invention is: V o =(1+D)(1-D)*V in , where V o is the output voltage; D is the duty cycle; V in is the input voltage.

[0075] Furthermore, the electric vehicle charging pile device also includes a working mode generation module. The working mode generation module is used to divide the power frequency working cycle corresponding to the electric vehicle charging pile device based on the pulse width modulation strategy to generate the working mode corresponding to the electric vehicle charging pile device.

[0076] In an embodiment of the present invention, the working mode generation module divides the industrial frequency working cycle corresponding to the electric vehicle charging pile device based on the pulse width modulation strategy to generate the working mode corresponding to the electric vehicle charging pile device, and the working mode includes working mode one, working mode two, working mode three and working mode four.

[0077] For easier understanding, see Figures 3 to 6 The specific circuit parameters of the electric vehicle charging pile device provided by the present invention are as follows: AC power supply voltage U S The effective value is set to 220V, the frequency is 50Hz, and the DC side output voltage U cd =800V, first inductor L1 = second inductor L2 = 2.2mH, output capacitor C1 = 220uF, switching frequency f s =10kHz, output load R L =80Ω. Based on the pulse width modulation strategy, the entire power frequency working cycle corresponding to the electric vehicle charging pile device is divided into four working modes:

[0078] Working mode 1: Figure 3 As shown, in the positive half cycle of the AC power source AC, the first diode D1 and the fourth diode D4 are turned on, and the first switch tube Q1 and the second switch tube Q2 are turned on at the same time. s Starting from the AC power source AC, it passes through the first diode D1, the first inductor L1, the second switch tube Q2 and the fourth diode D4, and finally flows back to the AC power source AC; at the same time, another path is that the current i s Starting from the AC power source AC, it passes through the first diode D1, the first switch tube Q1, the second inductor L2 and the fourth diode D4, and finally flows back to the AC power source AC. In this working mode, the first inductor L1 and the second inductor L2 are charged, and the voltage U between the terminal c and the terminal d is cd Equal to the capacitor voltage U c1 , capacitor voltage U C1 For output load R L Power is supplied and the capacitor voltage drops slowly.

[0079] Working mode 2: Figure 4 As shown, in the positive half cycle of the AC power source AC, the first diode D1, the fourth diode D4, and the output diode D5 are turned on, and the first switch tube Q1 and the second switch tube Q2 are turned off at the same time. s Starting from the AC power source AC, it passes through the first diode D1, the first inductor L1, the output diode D5, the output capacitor C1, the second inductor L2 and the fourth diode D4, and finally flows back to the AC power source AC; at the same time, another path is that the current i s Starting from the AC power source AC, through the first diode D1, the first inductor L1, the output diode D5, the output load RL , the second inductor L2 and the fourth diode D4, and finally flows back to the AC power supply AC. In this working mode, the power supply voltage is superimposed on the voltage of the first inductor L1 and the second inductor L2 to charge the output capacitor C1 and the output load R L Power is supplied, and the voltage of the first inductor L1 and the second inductor L2 decreases slowly.

[0080] Working mode three: Figure 5 As shown, in the negative half cycle of the AC power source AC, the first diode D1 and the fourth diode D4 are turned on, and the first switch tube Q1 and the second switch tube Q2 are turned on at the same time. s Starting from the AC power source AC, it passes through the first diode D1, the first inductor L1, the second switch tube Q2 and the fourth diode D4, and finally flows back to the AC power source AC; at the same time, another path is that the current i s Starting from the AC power source AC, it passes through the first diode D1, the first switch tube Q1, the second inductor L2 and the fourth diode D4, and finally flows back to the AC power source AC. In this working mode, the first inductor L1 and the second inductor L2 are charged, and the voltage U between the terminal c and the terminal d is cd Equal to the capacitor voltage U C1 , capacitor voltage U C1 For output load R L Power is supplied and the capacitor voltage drops slowly.

[0081] Working mode 4: Figure 6 As shown, in the negative half cycle of the AC power source AC, the first diode D1, the fourth diode D4, and the output diode D5 are turned on, and the first switch tube Q1 and the second switch tube Q2 are turned off at the same time. s Starting from the AC power source AC, it passes through the first diode D1, the first inductor L1, the output diode D5, the output capacitor C1, the second inductor L2 and the fourth diode D4, and finally flows back to the AC power source AC; at the same time, another path is that the current i s Starting from the AC power source AC, through the first diode D1, the first inductor L1, the output diode D5, the output load R L , the second inductor L2 and the fourth diode D4, and finally flows back to the AC power supply AC. In this working mode, the power supply voltage is superimposed on the voltage of the first inductor L1 and the second inductor L2 to charge the output capacitor C1 and the output load R L Power is supplied, and the voltage of the first inductor L1 and the second inductor L2 decreases slowly.

[0082] In an embodiment of the present invention, the electric vehicle charging pile device includes a diode rectifier bridge module, a symmetrical boost bridge module, an output module and an AC power supply module. One end of the diode rectifier bridge module is connected to the AC power supply module, and the other end of the diode rectifier bridge module is connected to one end of the symmetrical boost bridge module. The diode rectifier bridge module is used to obtain the AC power output by the AC power supply module and convert the AC power into a DC power supply. The other end of the symmetrical boost bridge module is connected to the output module, and the symmetrical boost bridge module is used to boost the voltage based on the DC power supply to generate a corresponding boost voltage. The output module is used to determine the output voltage corresponding to the electric vehicle charging pile device based on the boost voltage. The problem that the high-gain circuit corresponding to the existing electric vehicle charging pile device requires more devices is solved. As the number of devices increases, the loss in the circuit gradually increases, and the corresponding material cost also increases. Moreover, the more switching devices are used, the greater the failure rate will be, resulting in the poor stability of the constructed electric vehicle charging pile device. By improving the topological structure corresponding to the electric vehicle charging pile device, the symmetrical boost bridge module used can realize power factor correction, has the advantage of high voltage gain, and by using fewer power tubes, improves the power density, thereby improving the charging efficiency of the electric vehicle charging pile device.

[0083] See also Figure 7 , Figure 7 A flowchart of the steps of a control method applied to an electric vehicle charging pile device provided in an embodiment of the present invention.

[0084] The present invention provides a control method for an electric vehicle charging pile device, wherein the electric vehicle charging pile device comprises a diode rectifier bridge module 2, a symmetrical boost bridge module 3, an output module 4 and an AC power supply module 1. The method comprises:

[0085] Step 101: Obtain the AC power output by the AC power module 1 through the diode rectifier bridge module 2, and convert the AC power into a DC power.

[0086] Step 102: Boost the DC power supply by using the symmetrical boost bridge module 3 to generate a corresponding boost voltage.

[0087] Step 103: The output module 4 is used to determine the output voltage corresponding to the electric vehicle charging pile device based on the boost voltage.

[0088] In the embodiment of the present invention, the current starts from the AC power supply module 1, and the power supply is converted from the AC power supply to the DC power supply through the diode rectifier bridge module 2. At the same time, the input voltage corresponding to the power supply is boosted by the symmetrical boost bridge module 3 to obtain a boosted voltage. Finally, the output voltage corresponding to the electric vehicle charging pile device is determined based on the boosted voltage by the output module 4.

[0089] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0090] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0091] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0092] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0093] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0094] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An electric vehicle charging pile device, characterized in that: include: Diode rectifier bridge module, symmetrical boost bridge module, output module and AC power supply module; One end of the diode rectifier bridge module is connected to the AC power supply module; The other end of the diode rectifier bridge module is connected to one end of the symmetrical boost bridge module, and the diode rectifier bridge module is used to obtain the AC power output by the AC power supply module and convert the AC power into a DC power supply; The other end of the symmetrical boost bridge module is connected to the output module, and the symmetrical boost bridge module is used to boost the DC power supply to generate a corresponding boost voltage; The output module is used to determine the output voltage corresponding to the electric vehicle charging pile device based on the boost voltage; The diode rectifier bridge module includes a first diode, a second diode, a third diode and a fourth diode; One end of the AC power supply module and one end of the third diode are both connected to one end of the first diode; One end of the second diode and one end of the symmetrical boost bridge module are both connected to the other end of the first diode; The other end of the AC power supply module and one end of the fourth diode are both connected to the other end of the second diode; The other end of the third diode and the other end of the symmetrical boost bridge module are both connected to the other end of the fourth diode; The symmetrical boost bridge module comprises a first boost bridge and a second boost bridge; One end of the first boost bridge is connected to one end of the second boost bridge; One end of the diode rectifier bridge module and one end of the output module are both connected to the other end of the first boost bridge; The other end of the diode rectifier bridge module and the other end of the output module are both connected to the other end of the second boost bridge; The first boost bridge includes a first inductor and a first switch tube; the second boost bridge includes a second inductor and a second switch tube; One end of the diode rectifier bridge module and one end of the first switch tube are both connected to one end of the first inductor; One end of the second switch tube and one end of the output module are both connected to the other end of the first inductor; The other end of the first switch tube and the other end of the output module are both connected to one end of the second inductor; The other end of the second switch tube and the other end of the diode rectifier bridge module are both connected to the other end of the second inductor; The output module includes an output diode, an output capacitor and an output load; One end of the first inductor and one end of the second switch tube are both connected to one end of the output diode; One end of the output load and one end of the output capacitor are both connected to the other end of the output diode; The other end of the output load, one end of the first switch and one end of the second inductor are all connected to the other end of the output capacitor.

2. The electric vehicle charging pile device according to claim 1, characterized in that: It also includes a DC side gain calculation module; The gain calculation module is used to calculate the DC side gain corresponding to the electric vehicle charging pile device according to the working states corresponding to the first switch and the second switch.

3. The electric vehicle charging pile device according to claim 2, characterized in that: The DC side gain calculation module includes an inductance volt-second determination module, a DC side gain formula construction module and a DC side gain calculation submodule; The inductor volt-second determination module is used to determine the inductor volt-second corresponding to the working state according to the working states and corresponding inductor voltages corresponding to the first switch and the second switch; The DC side gain formula construction module is used to construct a DC side gain formula corresponding to the electric vehicle charging pile device based on the inductor volt-seconds and the inductor voltage; The DC side gain calculation submodule is used to substitute the input voltage corresponding to the electric vehicle charging pile device into the DC side gain formula to calculate the DC side gain corresponding to the electric vehicle charging pile device.

4. The electric vehicle charging pile device according to claim 3, characterized in that: The working state includes a first working state and a second working state; the inductance volt-second determination module performs the following steps: When the first switch and the second switch are in the first working state, obtaining a first inductor voltage corresponding to the electric vehicle charging pile device; Determining a first inductor volt-second corresponding to the first working state based on the first inductor voltage and a preset duty cycle; When the first switch and the second switch are in the second working state, obtaining a second inductor voltage corresponding to the electric vehicle charging pile device; A second inductor volt-second corresponding to the second working state is determined based on the second inductor voltage and the preset duty cycle.

5. The electric vehicle charging pile device according to claim 1, characterized in that: It also includes a working mode generation module; The working mode generation module is used to divide the industrial frequency working cycle corresponding to the electric vehicle charging pile device based on a pulse width modulation strategy to generate the working mode corresponding to the electric vehicle charging pile device.

6. A control method applied to the electric vehicle charging pile device according to claim 1, characterized in that: The electric vehicle charging pile device includes a diode rectifier bridge module, a symmetrical boost bridge module, an output module and an AC power supply module; the method includes: Acquire the AC power output by the AC power supply module through the diode rectifier bridge module, and convert the AC power into a DC power supply; Boosting the DC power supply by using the symmetrical boost bridge module to generate a corresponding boost voltage; The output module is used to determine the output voltage corresponding to the electric vehicle charging pile device based on the boost voltage.

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