CN204992572U - Modularization dc power distribution unit - Google Patents

Abstract

The utility model discloses a modular direct current power distribution unit, which comprises a casing, in which a direct current positive power board and a direct current negative power board are arranged in parallel, and the direct current positive power board and the direct current negative power board are connected through a spacer column, One end of the DC positive power board is provided with a positive power board terminal, and the positive power board terminal is connected to the output positive pole of the DC power supply module through the positive power line. One end of the DC negative power board is provided with a negative power board terminal, and the negative power board terminal passes through The negative power line is connected to the output negative pole of the DC power module, and the positive power switching switch for switching the positive power line is provided on the DC positive power board, and the negative power switching switch for switching the negative power line is provided on the DC negative The power board is connected with a control board for controlling the positive power switching switch and the negative power switching switch to ensure normal power output. The utility model has the advantages of flexible charging port expansion, convenient modular installation and maintenance, low configuration cost and high system integration.

Description

A Modular DC Power Distribution Unit

technical field

The utility model belongs to the field of electric vehicle charging, in particular to a modular direct current power distribution unit.

Background technique

With the increasing popularity of electric vehicles in my country, people's demand for electric vehicle charging facilities is becoming more and more urgent, and AC charging piles and DC charging piles have emerged as the times require. Among them, DC charging piles are more popular in large charging stations and public parking lots because of their faster high-voltage DC charging speed. At present, the mainstream equipment manufacturers of DC charging piles, the combination of power components and charging terminals can be divided into discrete charging piles and integrated charging piles. The common basic feature is that one power component only corresponds to one charging terminal. In this way, if the demand for large charging stations and charging terminals in public parking lots is large, it means that a corresponding number of power components is required. On the other hand, the probability of all charging terminals charging at full power at the same time is extremely low, resulting in low utilization of power components, large investment in charging facilities and prolonged cost recovery period, which is not economically applicable.

At present, there are two mature solutions in the industry to solve this problem: one is to use multiple high-power high-voltage DC relays to switch the power components in various combinations, so that the output terminal power can be adjusted to a certain extent. The utilization rate of power components has been improved, but there is still no sufficient flexibility, and at the same time, the cost remains high, which makes it difficult to meet the economical requirements; the other is to use a whole chassis, which is combined with switches inside, and the number of input power lines and output power lines It is certain that this solution is not convenient for flexible expansion of on-site charging ports, and the overall chassis installation is very complicated, and on-site maintenance is very complicated.

Utility model content

The purpose of this utility model is to provide a modular DC power distribution unit to overcome the above-mentioned defects in the prior art. The utility model has the advantages of flexible charging terminal expansion, modular installation, convenient on-site maintenance, low configuration cost, and system integration high merit.

In order to achieve the above object, the utility model adopts the following technical solutions:

A modular DC power distribution unit, including a casing, in which a DC positive power board and a DC negative power board are arranged in parallel, the DC positive power board and the DC negative power board are connected by spacers, and the DC positive power board One end is provided with a positive power board terminal, and the positive power board terminal is connected to the output positive pole of the DC power module through the positive power line. One end of the DC negative power board is provided with a negative power board terminal, and the negative power board terminal is connected to the The output negative pole of the DC power module, the DC positive power board is equipped with a positive power switching switch for switching the positive power line, and the DC negative power board is equipped with a negative power switching switch for switching the negative power line, the DC positive power board is connected to the useful The control board is used to control the positive power switching switch and the negative power switching switch to ensure the normal output of power.

Further, at least two positive power lines are connected to the positive power board terminal, and the positive power lines are connected to output positive poles of different DC power supply modules.

Further, there are at least two positive power switching switches.

Further, at least two negative power lines are connected to the terminals of the negative power board, and the negative power lines are connected to output negative poles of different DC power supply modules.

Further, there are at least two negative power switching switches.

Further, the DC negative power board is provided with a current detection component for detecting the magnitude of the output current.

Furthermore, a fuse for ensuring safe operation of the circuit is integrated on the negative power line.

Compared with the prior art, the utility model has the following beneficial technical effects:

The utility model combines the positive power line and the negative power line of at least two independent high-voltage DC power supply modules with a positive power switching switch and a negative power switching switch respectively through the idea of modular design, and then performs the total output of DC power. Modular DC power distribution unit, production and on-site installation can be carried out in batches with consistency. On-site installation can be directly plugged into the system power cabinet. Under the premise of a certain number of DC power modules, several charging terminals are needed, and several DC power distribution units are needed; and later maintenance only needs to replace the faulty DC power distribution unit. , without affecting the use of other DC power distribution units, which greatly promotes the batch application of DC charging facilities.

Description of drawings

Fig. 1 is the structural composition schematic diagram of the utility model;

Fig. 2 is the application effect schematic diagram of the utility model;

Fig. 3 is a schematic diagram of the principle of the utility model.

Among them, 1. Positive power board terminal; 2. Chassis; 3. DC negative power board; 4. DC positive power board; 5. Positive power switch; 6. Control board; 7. Panel; 8. Negative power board terminal ; 9. DC power supply module; 10. DC power distribution unit.

detailed description

Below in conjunction with accompanying drawing, the utility model is described in further detail:

Referring to Fig. 2, a modular DC power distribution unit is characterized in that it includes a casing 2, and a DC positive power board 4 and a DC negative power board 3 are arranged in parallel in the casing 2, and the DC positive power board 4 and the DC The negative power board 3 is connected through a spacer column, and one end of the DC positive power board 4 is provided with a positive power board terminal 1, and the positive power board terminal 1 is connected to the positive output pole of the DC power supply module 9 through a positive power line, wherein the positive power board terminal 1 is connected with at least two positive power lines, and the positive power lines are connected to the output positive poles of different DC power supply modules 9; one end of the DC negative power board 3 is provided with a negative power board terminal 8, and the negative power board terminal 8 passes through the negative The power line is connected to the output negative pole of the DC power supply module 9, wherein at least two negative power lines are connected to the negative power board terminal 8, and the negative power lines are connected to the output negative poles of different DC power supply modules 9; the DC positive power board 4 There are at least two positive power switching switches 5 for switching positive power lines, and at least two negative power switching switches for switching negative power lines are provided on the DC negative power board 3, and the DC positive power board 4 is connected to a useful Control the positive power switch 5 and the negative power switch to ensure the normal output of the control board 6 of the power.

Positive power board terminal 1 and negative power board terminal 8 serve as the external interface of the modular DC power distribution unit. The positive power terminals and negative power terminals of multiple modules can be plugged into the system backplane in Figure 2 to achieve flexible power Configuration; when multiple modular DC power distribution units combine the output branches of multiple DC power modules, each input power line of multiple DC power distribution units is connected in parallel, while the output power lines are independent. Each set of independent output power lines corresponds to a charging terminal; inside the DC power distribution unit, the DC positive power board 4 performs switching of multiple input DC positive power, while the DC negative power board 3 performs switching of multiple input DC negative power ;

Multiple DC positive and negative power lines and signal lines are integrated into pluggable connectors (pairs, male and female connectors), and male socket connectors are installed on the DC power distribution unit, which can be plugged into the connection back The female plug on the board realizes modular installation; the DC positive power board 4 and the DC negative power board 3 are respectively paired to complete a synchronous combination of a set of independent DC positive power lines and negative power lines, ensuring that each independent DC power module The positive and negative lines of 9 are operated by the modular power distribution unit at the same time;

The positive power switching switch 5 uses an electronic switch and a general power relay for topology and logic combination to realize the function of switching the positive high-voltage DC power line without arcing; the negative power switching switch only uses a general power relay for switching, and realizes no Under the premise of arc switching, switch the negative high-voltage DC power line; the electronic switch includes full-control power switches such as IGBT, MOSFET, IGCT, etc., and the ordinary power relay is a general-purpose AC relay; there is at least one micro on the control board 6 The controller MCU is used to complete the logic switching and state detection of the above-mentioned positive power switching switch 5 and negative power switching switch, so as to ensure the normal combined output of power.

The utility model also includes a total output current detection component, which is placed on the DC negative power board 3, and its detection signal is used as a power distribution unit to detect the output summary current of this module, and the signal is output to the system through the signal port, which is also used as a power distribution unit. The current detection signal of the application system; thus simplifies the system structure and reduces the system cost. The fuse is integrated on the negative power line, which also simplifies the system structure.

The operating process of the present utility model is described in detail below:

As shown in Figures 1 and 2, there are at least two independent DC power supply modules 9 on the charging system cabinet, at least two positive power lines and at least two negative power lines in pairs, through the female female terminals on the back panel, Enter the modular DC power distribution unit 10 . Take 10 DC power supply modules 9 (the output of each DC power supply module is 15KW) and the charging system of 5 modular DC power distribution units 10 as an example below to illustrate the implementation of the utility model:

As shown in Figure 1, the output positive power lines of 10 DC power modules and the output negative power lines of 10 DC power modules are respectively connected to the DC positive power board 4 and the DC power board through the positive power board terminal 1 and the negative power board terminal 8. Negative power board 3; the DC output positive power lines of the 10 DC power supply modules are respectively connected to the 10 positive power board terminals 1, and the DC output negative power lines of the 10 DC modules are respectively connected to the 10 negative power board terminals 8.

As shown in Figure 3, if 5 of the 10 DC power supply modules 9 in the system need to output through the 1# modular DC power distribution unit 10; and the power of the other 5 DC power supply modules 9 is distributed with the rest 4 modular DC power distribution units 10 . Now, the implementation manner in which the 1# modular DC power distribution unit performs power combination of 5 DC power modules will be described in detail.

For example, 1# DC power module, 2# DC power module, 3# DC power module, 4# DC power module, 5# DC power module, five positive power switching switches S1+, S2+, S3+, S4+, S5+ and five Negative power switching switches S1-, S2-, S3-, S4-, S5- are respectively closed in a certain order, and finally the positive power and negative power of the five DC power modules are combined as the total DC power of the charging terminal. output.

Claims (7)

1. A modular DC power distribution unit is characterized in that: it comprises a casing (2), and a DC positive power board (4) and a DC negative power board (3) are parallelly arranged in the casing (2), the DC The positive power board (4) and the DC negative power board (3) are connected through a spacer column, and one end of the DC positive power board (4) is provided with a positive power board terminal (1), and the positive power board terminal (1) passes through the positive power line Connected to the output positive pole of the DC power supply module (9), one end of the DC negative power board (3) is provided with a negative power board terminal (8), and the negative power board terminal (8) is connected to the DC power supply module (9) through a negative power line ), the DC positive power board (4) is provided with a positive power switching switch (5) for switching the positive power line, and the DC negative power board (3) is provided with a negative power switching switch for switching the negative power line, The DC positive power board (4) is connected with a control board (6) for controlling the positive power switching switch (5) and the negative power switching switch to ensure normal power output. 2. A modular DC power distribution unit according to claim 1, characterized in that at least two positive power lines are connected to the positive power board terminal (1), and the positive power lines are connected to different DC power supply modules (9) output positive. 3. A modular DC power distribution unit according to claim 2, characterized in that there are at least two positive power switching switches (5). 4. A modular DC power distribution unit according to claim 1, characterized in that at least two negative power lines are connected to the negative power board terminal (8), and the negative power lines are connected to different DC power modules (9) output negative pole. 5. A modular DC power distribution unit according to claim 4, characterized in that there are at least two negative power switching switches. 6. A modular DC power distribution unit according to claim 1, characterized in that a current detection component for detecting the magnitude of the output current is provided on the DC negative power board (3). 7. A modular DC power distribution unit according to claim 1, characterized in that a fuse for ensuring safe operation of the circuit is integrated on the negative power line.