A dynamic switching system of a direct current charging pile power module

Abstract

The application discloses a dynamic switching system of a direct-current charging pile power module, which is ring-shaped, and a plurality of power modules are uniformly distributed on the outermost layer; the inner layer is a charging pile; the power module and the charging pile are connected through a power switch, a switching switch and a load switch; a switching strategy algorithm module monitors the power demand of an external terminal and the time when a user expects to use the charging pile to charge the external terminal, thereby calculating a charging priority list of the external terminal and completing grouping of the power modules; in addition, the charging priority can be adjusted by a charging administrator; finally, a control module controls the power modules in the same group to be connected to the same charging pile, and controls the power switch, the switching switch and the load switch in the same group to be turned on, thereby charging the external terminal; in this way, the number of switches used is greatly reduced, the system cost is lowered, and the switching process is simplified.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of charging piles, and more particularly relates to a dynamic switching system of a DC charging pile power module. BACKGROUND

[0002] At present, the DC charging equipment on the market relies on power modules to output DC current after rectification, filtering and voltage stabilization of the input three-phase alternating current to provide the current required by the charging vehicle. The power level of the DC charging equipment is adjusted by changing the number of power modules, so as to be suitable for various types of electric vehicles. The power modules in the charging equipment output power to the vehicle through multiple parallel modes.

[0003] The existing DC charging pile adopts a large-power integrated multi-gun DC charging device. This device mostly adopts two charging modes of round charging and uniform charging. In round charging, only one vehicle is charged at the same time to maximize the charging power. In uniform charging, multiple vehicles can be charged at the same time to maximize the utilization of power modules. The large-power integrated multi-gun DC charging has the advantage that the power still meets the needs of all vehicles when multiple vehicles are charged at the same time. However, in the later stage of the charging process, the power of the load will reach saturation, and the power modules distributed to the load in the charging equipment do not decrease, resulting in a decrease in the output current of the power module and a decrease in the efficiency of power output.

[0004] In the prior art, a DC charging equipment power module dynamic switching method is adopted. The power modules inside the charging equipment are switched by IGBTs, so that the excess power modules can be switched to the remaining loads in the later stage of the load charging, so as to achieve the full utilization of the power modules. However, when the number of power modules and loads is large, the number of IGBTs required also increases. When there are M power modules and N loads, the number of IGBTs is 2*M*N, the cost is greatly increased, and the switching process becomes more complex, and the requirements for the control module are higher. In order to compensate for the disadvantages of this method, the method needs to be improved to reduce the number of switches while meeting the power switching requirements. SUMMARY

[0005] The present application aims to overcome the shortcomings of the prior art and provide a DC charging pile power module dynamic switching system that uses as few switches as possible while meeting the power switching requirements, thereby improving the utilization rate of the DC charging pile power module.

[0006] To achieve the above-mentioned purposes, the application discloses a dynamic switching system of a DC charging pile power module, which is characterized by comprising a control module, a plurality of power modules, a power switch module composed of a plurality of power switches, a switch switching module composed of a plurality of switching switches, a load switch module composed of a plurality of load switches, a switching strategy algorithm module and a plurality of charging piles.

[0007] The entire dynamic switching system is ring-shaped, and a plurality of power modules are uniformly distributed on the outermost layer, and charging piles are on the inner layer, and the power modules and the charging piles are connected through power switches, switching switches and load switches.

[0008] The control module is connected with each power switch, each switching switch and each load switch, each power module is connected with a corresponding power switch, each power switch is connected with a corresponding load switch through a corresponding switching switch, and each charging pile is connected with two corresponding load switches.

[0009] An external terminal is connected with the charging pile through a charging port of the external terminal, after the connection is completed, a user inputs a time when the external terminal expects to use the charging pile for charging through the charging pile, then the charging pile reads power demand of the external terminal and the time when the external terminal expects to charge and feeds back to the switching strategy algorithm module, the switching strategy algorithm module calculates a charging priority list of the external terminal according to the time when the external terminal expects to charge, after the charging priority list of the external terminal is calculated, if the charging priority of the external terminal suddenly changes, a charging manager can manually adjust the charging priority at any time.

[0010] In addition, the switching strategy algorithm module monitors the power demand of the external terminal in real time, if the charging of the external terminal is completed or a new external terminal is added, the control module controls all switches to be disconnected, then a charging priority list of the external terminal needing to be charged is regenerated, after the power module grouping is completed, the control module sends an instruction to the power switch, the switching switch and the load switch, so that the corresponding charging pile is powered again.

[0011] The application is achieved as follows:

[0012] The dynamic switching system of the DC charging pile power module of the application presents a ring shape, and a plurality of power modules are uniformly distributed in the outermost layer, and the inner layer is a charging pile, and the power module and the charging pile are connected through a power switch, a switching switch and a load switch; the switching strategy algorithm module monitors the power demand of the external terminal and the time when the user expects to use the charging pile to charge the external terminal in real time, thereby calculating the charging priority list of the external terminal and completing the grouping of the power module, in addition, the charging administrator can artificially adjust the charging priority, and finally the control module controls the power module in the same group to be connected to the same charging pile, and controls the corresponding power switch, switching switch and load switch in the same group to be turned on, thereby charging the external terminal; in this way, the number of switches used is greatly reduced, the system cost is reduced, and the switching process is also simplified. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a schematic diagram of the dynamic switching system of the DC charging pile power module of the application;

[0014] Figure 2 is a schematic diagram of the dynamic switching system of the DC charging pile power module of the application;

[0015] Figure 3 is a schematic diagram of the dynamic switching system of the DC charging pile power module of the application;

[0016] Figure 4 is a schematic diagram of the dynamic switching system of the DC charging pile power module of the application. DETAILED DESCRIPTION

[0017] The specific embodiments of the application will be described below with reference to the accompanying drawings, so that those skilled in the art can better understand the application. It should be particularly noted that in the following description, when the detailed description of the known functions and designs may obscure the main content of the application, these descriptions will be omitted here.

[0018] EMBODIMENT

[0019] Figure 1 is a schematic diagram of the dynamic switching system of the DC charging pile power module of the application.

[0020] In this embodiment, as shown in Figure 1 , the dynamic switching system of the DC charging pile power module of the application comprises a control module, a plurality of power modules, a power switch module composed of a plurality of power switches, a switching switch module composed of a plurality of switching switches, a load switch module composed of a plurality of load switches, a switching strategy algorithm module and a plurality of charging piles; wherein the power modules are electrically connected with the charging piles through the power switch module, the switching switch module and the load switch module.

[0021] AsFigure 2 As shown, the entire dynamic switching system presents a ring shape, the outermost layer is evenly distributed with several power modules, numbered S1-S16, and the inner layer is charging piles, numbered K1-K4; the power modules and charging piles are connected through power switches S17-S32, switch switching modules S33-S40 and load switches;

[0022] In this embodiment, the control module needs to be connected with each power switch, each switching switch and each load switch respectively, so as to facilitate the control of the on-off of each switch; for example, Figure 2 As shown, in this embodiment, the number of power modules is N=16, the number of power switches is N=16, the number of switching switches is N=16, and the number of load switches is 2M=8, so the total number of switches is 2*(M+N), each power module is connected with a unique power switch, each charging pile is connected through two load switches, and the load switch is connected with the power switch through the switching switch;

[0023] The external terminal is connected with the charging pile through the charging port of the external terminal, after the connection is completed, the user inputs the time when the external terminal expects to use the charging pile for charging through the charging pile; then, the charging pile reads the power demand of the external terminal and the time when the external terminal expects to charge and feeds back to the switching strategy algorithm module; the switching strategy algorithm module calculates the charging priority list of the external terminal according to the time when the external terminal expects to charge; in this embodiment, the charging priority list is arranged in ascending order according to the length of the time when the external terminal expects to charge, that is, the shorter the expected charging time, the higher the emergency degree of the external terminal, and the higher the charging priority, and vice versa.

[0024] After calculating the charging priority list of the external terminal, if the charging priority of a certain external terminal suddenly changes, for example: all the external terminals on the charging piles in the system have not completed charging, but a user suddenly needs to use the external terminal, and at this time the switching strategy algorithm module has not monitored the new external terminal or the external terminal that has completed charging, so it cannot calculate a new charging priority list, then at this time the charging administrator needs to manually adjust the charging priority manually, so that the external terminal of the user is at the highest, and the adjustment is not limited by time and can be performed at any time;

[0025] Meanwhile, the switching strategy algorithm module groups the power modules according to the power demand of the external terminals, and the grouping principle is that the higher the charging priority of the external terminal is, the more power modules the switching strategy algorithm module allocates to the corresponding charging pile, and the idle power modules are preferentially allocated; wherein, for the external terminal with the highest charging priority, full power output is required for the charging pile; on the contrary, if the external terminal with the lowest charging priority, the power module is not allocated to the charging pile temporarily, and the power module is allocated after the charging priority of the external terminal corresponding to the charging pile is improved; after the grouping is completed, the control module controls the power modules in the same group to be connected to the same charging pile, and controls the corresponding power switch, switching switch and load switch in the same group to be turned on so as to charge the external terminal;

[0026] In addition, the switching strategy algorithm module monitors the power demand of the external terminals in real time, and if a certain external terminal is charged or a new external terminal is added, the control module controls all switches to be disconnected first, and then generates a charging priority list for the external terminals that need to be charged, and after the power module grouping is completed, the control module issues instructions to the power switch, switching switch and load switch to supply power to the corresponding charging pile again.

[0027] Next, we will discuss the cases of fewer power units and more power units when there are four charging piles.

[0028] Embodiment 1, as shown in Figure 3 When the power modules are few (for example, 4 charging piles and 13 power modules), 24 power modules are required in an ideal case to ensure full power operation of the 4 charging piles, but generally the number of power modules cannot meet this requirement, and the charging strategy is: when charging piles 1, 2 and 3 have vehicles, assuming that the charging priority at this time is 2>3>1, charging pile 2 and charging pile 3 are running at full power, and charging pile 1 has only one power module, and the on-off state of the switch is that S1-S13 are all turned on, S14, S16, S29, S22, S32 are disconnected, and the remaining switches can be turned on. When charging pile 4 has a vehicle to be charged, the charging priority at this time is 4>2>3>1, all switches are disconnected first to disconnect the connection between the power module and the charging pile, and the switches are adjusted again, and the on-off state of the switches at this time is that S22, S33, S14, S28, S29, S21 are all disconnected, and the remaining switches can be turned on. At this time, the charging condition is that charging pile 4 and charging pile 2 are running at full power, charging pile 3 has only one power module, and charging pile 1 has no power module.

[0029] Embodiment 2, as shown in Figure 4As shown, when there are more power modules (still unable to meet the full power operation of all charging piles) (for example, 4 charging piles and 17 power modules), when charging piles 1, 2 and 3 have vehicles charging, assuming that the charging priority at this time is still 2>3>1, charging pile 2 and charging pile 3 can operate at full power, charging pile 1 has 5 power modules, and the on-off state of the switches is that S20, S26, S32, S41 and S42 are all disconnected, and the remaining switches can be turned on; when charging pile 4 has a vehicle to be charged, at this time the charging priority is 4>2>3>1, first disconnect all switches to disconnect the connection between the power module and the charging pile, and then adjust the switches, at this time the on-off state of the switches can be S23, S38, S35, S36, S28 and S34, and the remaining switches can be turned on. At this time, the charging condition is that charging pile 4 and charging pile 2 operate at full power, charging pile 3 has 5 power modules, and charging pile 1 has no power module.

[0030] Although the above describes the specific embodiments of the present application in order to facilitate the understanding of the present application by those skilled in the art, it should be clear that the present application is not limited to the scope of the specific embodiments, and for those skilled in the art, all kinds of changes are obvious within the spirit and scope of the present application as defined and limited by the appended claims, and all kinds of changes are included in the protection of the present application.

Claims

1. A dynamic switching system of DC charging pile power modules, characterized in that, The application relates to a dynamic switching system for charging piles. The whole dynamic switching system is ring-shaped, and a plurality of power modules are uniformly distributed on the outermost layer, and charging piles are arranged in the inner layer. The control module is connected with each power switch, each switching switch and each load switch. An external terminal is connected with a charging pile through a charging port of the external terminal. The charging pile reads the power demand of the external terminal and the time when the external terminal expects to be charged and feeds back to the switching strategy algorithm module. The switching strategy algorithm module calculates a charging priority list of the external terminal according to the time when the external terminal expects to be charged. If the charging priority of a certain external terminal suddenly changes, the charging management personnel can manually adjust the charging priority at any time. In addition, the switching strategy algorithm module monitors the power demand of the external terminal in real time.

2. The dynamic switching system of a DC charging pile power module according to claim 1, characterized in that, If a certain external terminal is charged or a new external terminal is added, the control module controls all switches to be disconnected, then generates a charging priority list for the external terminal that needs to be charged, and then controls the power switch, the switching switch and the load switch to supply power to the corresponding charging pile.

3. The dynamic switching system of a DC charging pile power module according to claim 1, characterized in that, The charging priority list is arranged in ascending order according to the time when the external terminal expects to be charged. The higher the charging priority of the external terminal, the more power modules are allocated to the corresponding charging pile by the switching strategy algorithm module, and the idle power modules are preferentially allocated. If the charging priority of the external terminal is the highest, the charging pile needs to be fully powered. If the charging priority of the external terminal is the lowest, the charging pile is not temporarily allocated power modules. When the charging priority of the external terminal corresponding to the charging pile is improved, the power modules are allocated.

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