CN206908514U - A kind of modularization bidirectional, dc power distributing unit - Google Patents

Abstract

The utility model discloses a modularized two-way DC power distribution unit, which comprises a casing, in which DC positive and negative power boards are arranged, a positive power board terminal is arranged on the DC positive power board, and the positive power board terminal is connected to the DC power Module, the DC negative power board is provided with a negative power board terminal, the negative power board terminal is connected to the DC power module, the DC positive power board is provided with a positive power bidirectional switch, the DC negative power board is provided with a negative power switch, and the DC positive There is a control board on the power board; the positive power bidirectional switch includes the first and second power ports, and a bidirectional switch group; the positive power line and the negative power line of at least two independent DC power modules are respectively adopted by the positive power bidirectional switch and the The negative power switching switches are combined so as to directly output the total power of at least two DC power modules. The utility model has the advantages of flexible switching of input and output ports, modular installation, convenient on-site maintenance, low configuration cost and high system integration.

Description

A Modular Bidirectional DC Power Distribution Unit

technical field

The utility model belongs to the technical field of electric vehicle charging, and relates to a DC power distribution unit, in particular to a modular bidirectional DC power distribution unit.

Background technique

With the increasing popularity of electric vehicles in our country, the demand for charging electric vehicles is increasing. In the current charging mode, electric energy can only flow from the grid to the battery pack through the charger, and the energy flows in one direction. If car owners often charge in a concentrated manner, especially during the daytime peak power consumption, the charging cost will be greatly increased, and it will also cause a serious impact on the power grid. It is difficult to guarantee the safety of the power grid and energy security, and the total power of the regional power grid needs to be continuously improved and increased. .

At present, the solution to this problem is mainly to achieve staggered peak charging, and encourage users to take power at night when the power consumption is low, so as to reduce charging costs and reduce the impact on the power grid during peak periods. However, many car owners still choose to charge as they use during the day. When the number of electric vehicles reaches a certain scale, it will still greatly affect the power stability of the regional power grid, and the impact on the power grid cannot be eradicated. Therefore, there is an urgent need in the art to solve such problems from a technical point of view.

Utility model content

The purpose of this utility model is to overcome the shortcomings of the above-mentioned prior art, and provide a modular bidirectional DC power distribution unit, which has flexible switching of input and output ports, modular installation, convenient on-site maintenance, low configuration cost, and high system integration The advantages.

The purpose of this utility model is achieved through the following technical solutions:

The utility model modularized two-way DC power distribution unit comprises a casing, in which a DC positive power board and a DC negative power board are arranged, 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 port positive pole of the DC power module, 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 port negative pole of the DC power module, and at least two are provided on the DC positive power board for switching the positive power line There are at least two negative power switches for switching the negative power line on the DC negative power board, and the DC positive power board is connected with a positive power two-way switch and a negative power switch to ensure A control board for normal power output; the positive power bidirectional switch includes a first power port, a second power port, and a bidirectional switch group that connects and controls the bidirectional on-off of the first power port and the second power port; at least two The positive power line and the negative power line of the independent DC power module are respectively combined with a positive power bidirectional switch and a negative power switch, so as to directly output the total power of at least two DC power modules.

Further, the bidirectional switch group of the present utility model has multiple schemes, wherein in the first scheme: the bidirectional switch group includes a first switch group connecting one pole of the first power port and one pole of the second power port, and connecting the first power The second switch group of the other pole of the port and the other pole of the second power port; the first switch group is a third relay; the second switch group includes a first relay and a second relay connected in series with the first relay For a relay, the second switch group further includes a first diode, a second diode, a first full-control semiconductor device and a second full-control semiconductor device; the first diode is connected in parallel to the first relay, The second diode is connected in parallel on the second relay, the anode of the first diode and the anode of the second diode are connected together and the connection point is connected between the first relay and the second relay; the first full control type The semiconductor device is connected in parallel on the first diode, and the second fully-controlled semiconductor device is connected in parallel on the second diode.

Further, in the second solution: the bidirectional switch group includes a first switch group connecting one pole of the first power port with one pole of the second power port, and a switch group connecting the other pole of the first power port with the other pole of the second power port The second switch group and the third switch group; the first switch group is a third relay; the second switch group includes a first relay and a second relay connected in series on the first relay, and the second switch group It also includes a first diode, a second diode, a first full-control semiconductor device and a second full-control semiconductor device, the first diode is connected in parallel to the first relay, and the second diode is connected in parallel to the second relay. On the second relay, the anode of the first diode and the anode of the second diode are connected together and the connection point is connected between the first relay and the second relay; the first fully-controlled semiconductor device is connected in parallel with the first diode On the tube, the second fully-controlled semiconductor device is connected in parallel to the second diode; the third switch group is a fourth relay.

Further, in the third solution, the bidirectional switch group includes a second switch group and a third switch group connecting one pole of the first power port and one pole of the second power port; the second switch group includes a first relay and a The second relay on the first relay, the second switch group also includes a first diode, a second diode, a first full-control semiconductor device and a second full-control semiconductor device; the first diode Connected in parallel to the first relay, the second diode is connected in parallel to the second relay, the anode of the first diode and the anode of the second diode are connected together and the connection point is connected between the first relay and the second relay Between; the first fully-controlled semiconductor device is connected in parallel on the first diode, and the second fully-controlled semiconductor device is connected in parallel on the second diode.

Further, the above-mentioned fully-controlled semiconductor device is an IGBT type.

Further, the above-mentioned fully-controlled semiconductor device is a MOFET type.

Further, the above-mentioned fully controlled semiconductor device is an IGCT type.

Further, the above-mentioned multiple DC positive and negative power lines and signal lines are integrated into a pluggable connector, and a male pin connector is installed on the modular bidirectional DC power distribution unit, which is plugged into a female socket on the connection backplane Connectors to achieve modular plug-in installation; DC positive power boards and DC negative power boards are paired to complete a synchronous combination of a set of independent DC positive power lines and negative power lines, and the positive and negative power lines of each DC power module are connected simultaneously. operate.

Further, the above-mentioned pluggable connectors are in pairs, including a male pin connector and a female socket connector.

Further, the utility model also includes a current detection component, the current detection component is arranged on the DC negative power board, the current detection component detects the output summary current of the modular bidirectional DC power distribution unit, and the detected detection signal passes through the signal port It is output to the application system and used as the current detection signal of the application system.

The utility model has the following beneficial effects:

The modular bidirectional DC power distribution unit of the utility model can not only improve the utilization rate of the charging machine terminal, but also greatly promote the batch application of DC charging facilities, and can also realize the feedback of electric energy from the battery pack of the electric vehicle through the power module to the With the function of the power grid, car owners can charge at night when the electricity price is low, and sell electricity to the grid at peak power consumption, which not only increases the willingness of car owners to charge at night, but also brings profits to car owners. pressure, enhance grid resilience, and benefit grid security.

Description of drawings

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

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

Fig. 3 is the circuit diagram of the first scheme of the bidirectional switch group of the present invention;

Fig. 4 is the circuit diagram of the second scheme of the bidirectional switch group of the present invention;

Fig. 5 is the circuit diagram of the third scheme of the bidirectional switch group of the present invention;

Fig. 6 is a schematic diagram of the principle of the utility model adopting the first scheme of the bidirectional switch group.

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

detailed description

In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the utility model. Obviously, the described The embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

It should be noted that the terms "first" and "second" in the specification and claims of the present utility model and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific order or sequence . It is to be understood that the data so used are interchangeable under appropriate circumstances such that the embodiments of the invention described herein can be practiced in sequences other than those illustrated or described herein.

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

Referring to Fig. 1, the modular bidirectional DC power distribution unit of the present invention includes a casing 2, in which a DC positive power board 4 and a DC negative power board 3 are arranged in parallel, and a DC positive power board 4 and a DC negative power board 3 Connected through a spacer column, 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 pole of the DC power module 9 port through a positive power line, wherein the positive power board terminal 1 is connected to at least Two positive power lines, and the positive power lines are connected to the positive poles of ports 9 of different DC power modules; 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 module through the negative power line 9-port negative pole, 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 9-port negative poles of different DC power modules; The positive power two-way switching switch 5 of the power line, the DC negative power board 3 is provided with at least two negative power switching switches for switching the negative power line, and the DC positive power board 4 is connected with a positive power bidirectional switching switch 5 and Negative power switching switch is used to ensure the control board 6 of the normal output of power, and the control board 6 is provided with a microcontroller MCU. As shown in Figure 3: the utility model positive power bidirectional switch 5 includes a first power port 5-1, a second power port 5-2, and connects and controls the first power port 5-1 and the second power port 5- 2. A bidirectional switch group with bidirectional on-off; combine the positive power lines and negative power lines of at least two independent DC power modules 9 with the positive power bidirectional switching switch 5 and the negative power switching switch respectively, so as to directly output at least two DC The total power of the power module 9. The modular design of the bi-directional DC power distribution unit can be combined with the DC power module arbitrarily. On the premise of a certain number of DC power modules, if several charging terminals are needed, several bi-directional DC power distribution units need to be added, and the later maintenance only needs to be replaced. A faulty bidirectional DC power distribution unit does not affect the use of other bidirectional DC power distribution units.

Described in conjunction with Figure 2: the positive power board terminal 1 and the negative power board terminal 8 serve as the external interface of the modular bidirectional DC power distribution unit, and 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; the power lines of each power port A of multiple DC power distribution units are connected in parallel, while the power lines of power port B are independent, and each group of independent power port B power lines corresponds to a Charging and discharging terminal; inside the DC power distribution unit, the DC positive power board 4 switches multiple input (output) DC positive powers, and the DC negative power board 3 switches multiple input (output) DC negative powers.

Multiple DC positive and negative power lines and signal lines, integrated in pluggable connectors (pairs, male pin connectors and female socket connectors), male pin connectors are installed on the DC power distribution unit, It can be plugged into the female socket connector on the connection backplane to realize 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, It is ensured that the positive and negative power lines of each independent DC power module 9 are simultaneously operated by the modular power distribution unit.

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 application system through the signal port, and As the current detection signal of its application system; this simplifies the system structure and reduces the system cost. The fuse is integrated on the negative power line, which also simplifies the system structure.

In the positive power bidirectional switch 5 of the present utility model, the bidirectional switch group has multiple schemes, which are described in detail below in conjunction with the accompanying drawings:

Referring to Fig. 3: In the first scheme of the bidirectional switch group: the bidirectional switch group includes the first switch group 5-3 connecting one pole of the first power port 5-1 and one pole of the second power port 5-2, and connecting The other pole of the first power port 5-1 and the second switch group 5-4 of the other pole of the second power port 5-2; the first switch group 5-3 is a third relay S3; the second switch group 5- 4 includes the first relay S1 and the second relay S2 connected in series with the first relay S1, the second switch group 5-4 also includes the first diode D1, the second diode D2, the first fully-controlled semiconductor device K1 and the second fully-controlled semiconductor device K2; the first diode D1 is connected in parallel on the first relay S1, the second diode D2 is connected in parallel on the second relay S2, the anode of the first diode D1 and the second The anodes of the diode D2 are connected together and the connection point is connected between the first relay S1 and the second relay S2; the first full-control semiconductor device K1 is connected in parallel on the first diode D1, and the second full-control semiconductor The device K2 is connected in parallel to the second diode D2; the microcontroller MCU is connected to all relays and all fully-controlled semiconductor devices in the bidirectional switch group through the drive circuit.

Referring to Fig. 4, in the second scheme of the bidirectional switch group: the bidirectional switch group includes a first switch group 5-3 connecting one pole of the first power port 5-1 and one pole of the second power port 5-2, and connecting The other pole of the first power port 5-1 and the second switch group 5-4 and the third switch group 5-5 of the other pole of the second power port 5-2; the first switch group 5-3 is a third relay S3; the second switch group 5-4 includes a first relay S1 and a second relay S2 connected in series with the first relay S1, and the second switch group 5-4 also includes a first diode D1 and a second diode D2 , the first fully-controlled semiconductor device K1 and the second fully-controlled semiconductor device K2, the first diode D1 is connected in parallel to the first relay S1, the second diode D2 is connected in parallel to the second relay S2, the first two The anode of the pole tube D1 and the anode of the second diode D2 are connected together and the connection point is connected between the first relay S1 and the second relay S2; the first fully-controlled semiconductor device K1 is connected in parallel with the first diode D1 On, the second fully controlled semiconductor device K2 is connected in parallel on the second diode D2; the third switch group 5-5 is a fourth relay S4; the microcontroller MCU is connected to all relays and all Fully controlled semiconductor device.

Referring to Fig. 5, in the third scheme of the bidirectional switch group: the bidirectional switch group includes a second switch group 5-4 and a third power port 5-2 connecting one pole of the first power port 5-1 and one pole of the second power port 5-2. The switch group 5-5; the second switch group 5-4 includes a first relay S1 and a second relay S2 connected in series on the first relay S1, and the second switch group 5-4 also includes a first diode D1, a second Diode D2, the first fully-controlled semiconductor device K1 and the second fully-controlled semiconductor device K2; the first diode D1 is connected in parallel to the first relay S1, and the second diode D2 is connected in parallel to the second relay S2 , the anode of the first diode D1 and the anode of the second diode D2 are connected together and the connection point is connected between the first relay S1 and the second relay S2; the first fully-controlled semiconductor device K1 is connected in parallel with the first On the diode D1, the second full-control semiconductor device K2 is connected in parallel on the second diode D2; the third switch group 5-5 is a fourth relay S4; the microcontroller MCU is connected to the bidirectional switch group through the driving circuit All relays and all fully controlled semiconductor devices.

In the bidirectional switch group of the present invention, the fully controlled semiconductor device is an IGBT type, a MOSFET type or an IGCT type.

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 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 bidirectional DC power distribution unit 10 . Taking the charging system of 10 DC power modules 9 (each DC power module output is 15KW) and 5 modular bidirectional DC power distribution units 10 as an example, the implementation of the present utility model will be described below:

As shown in Figure 1, the positive power lines of the 10 DC power module ports and the negative power lines of the 10 DC power module ports are respectively connected to the DC positive power board 4 and the DC negative power board through the positive power board terminal 1 and the negative power board terminal 8. Board 3; the positive power lines of the 10 DC power module ports are respectively connected to the 10 positive power board terminals 1, and the 10 DC power module port negative power lines are respectively connected to the 10 negative power board terminals 8.

As shown in Figure 6: the figure only shows the connection relationship between 10 DC power modules 9 and one of the modular bidirectional DC power distribution units, and the others are similar; each modular bidirectional DC power distribution unit consists of 10 high voltage DC bidirectional Composed of on-off switches, the positive power bidirectional switching switches S1+, S2+...S10+ are integrated on the DC positive power board, connecting the power ports A1+, A2+...A10+ and power port B+, and the negative power switching switches S1-, S2-...S10- are integrated on the On the DC negative power board, connect the power ports A1-, A2-...A10- and power ports B-, the bidirectional switching is mainly realized on the positive power bidirectional switching switches S1+, S2+...S10+, and each modular bidirectional DC power distribution unit corresponds to 10 DC power modules and 1 power port B (such as a port that can be connected to a charging gun), the positive power bidirectional switch contains at least two relays, two fully-controlled semiconductor devices and two diodes, and the fully-controlled semiconductor devices can It is IGBT, MOSFET, IGCT, and there is at least one microcontroller MCU on the control board, which is used to complete the logic switching and state detection of the above-mentioned positive power bidirectional switch and negative power switch, so as to ensure the normal combined output of power. The power distribution of the DC power module and the bidirectional flow of energy are realized through the on-off switching of the relay and the fully-controlled semiconductor device. Now, the implementation manner in which the 1# modular bidirectional DC power distribution unit performs power distribution of 5 DC power modules will be described in detail.

For example, DC power module 1, DC power module 2, ... DC power module 10, then 10 positive power bidirectional switches S1+, S2+, ... S10+ and 10 negative power switches S1-, S2-, ... S10- respectively In order to close, 5 of the DC power modules can be assigned to the 1# bidirectional DC power distribution unit, and finally the positive power and negative power of the 5 DC power modules are combined, and the total power is output from the power port B; the power port B can also be used as an input port, through 10 positive power bidirectional switches S1+, S2+, ... S10+ and 10 negative power switches S1-, S2-, ... S10- respectively closed in a certain order, and finally 1# bidirectional DC The power distribution unit distributes the total power input from power port B to the five DC power modules. In order to achieve the purpose of bidirectional flow of electric energy.

Figure 6 is only an embodiment, it should be noted that the number of bidirectional on-off circuits in each bidirectional DC power distribution unit corresponds to the number of DC power modules, and the bidirectional on-off circuits are arranged in a certain order Closed, the DC power modules can be flexibly allocated, and the technical solution of the present application can be applied to different combinations.

Claims (10)

1. A modular bidirectional DC power distribution unit is characterized in that it comprises a casing (2), and the casing (2) is provided with a DC positive power board (4) and a DC negative power board (3), and the DC positive power One end of the board (4) is provided with a positive power board terminal (1), and the positive power board terminal (1) is connected to the positive pole of the port of the DC power module (9), and one end of the DC negative power board (3) is provided with a negative power The board terminal (8), the negative power board terminal (8) is connected to the negative pole of the DC power module (9), and the DC positive power board (4) is provided with at least two positive power bidirectional switches for switching the positive power line ( 5), the DC negative power board (3) is provided with at least two negative power switching switches for switching the negative power line, and the DC positive power board (4) is connected with a bidirectional switching switch (5) and a negative power switching switch (5) for controlling the positive power line. The control panel (6) of power switching switch to ensure the normal output of power; the positive power bidirectional switching switch (5) includes a first power port (5-1), a second power port (5-2), and a connection and control The first power port (5-1) and the second power port (5-2) bidirectional switch group; the positive power line and the negative power line of at least two independent DC power modules (9) are respectively used as positive power lines. The power bidirectional switch (5) and the negative power switch are combined to directly output the total power of at least two DC power modules (9). 2. The modularized bidirectional DC power distribution unit according to claim 1, wherein the bidirectional switch group includes a pole connected to the first power port (5-1) and a pole of the second power port (5-2). The first switch group (5-3) of one pole, and the second switch group (5-4) connecting the other pole of the first power port (5-1) and the other pole of the second power port (5-2); The first switch group (5-3) is a third relay (S3); the second switch group (5-4) includes a first relay (S1) and a first relay connected in series to the first relay (S1). Two relays (S2), the second switch group (5-4) also includes a first diode (D1), a second diode (D2), a first fully-controlled semiconductor device (K1) and a second Fully controlled semiconductor device (K2); the first diode (D1) is connected in parallel on the first relay (S1), the second diode (D2) is connected in parallel on the second relay (S2), and the first diode (D1) and the anode of the second diode (D2) are connected together and the connection point is connected between the first relay (S1) and the second relay (S2); the first fully controlled semiconductor device (K1) It is connected in parallel on the first diode (D1), and the second fully-controlled semiconductor device (K2) is connected in parallel on the second diode (D2). 3. The modularized bidirectional DC power distribution unit according to claim 1, wherein the bidirectional switch group includes a pole connected to the first power port (5-1) and a pole of the second power port (5-2). pole first switch group (5-3), and the second switch group (5-4) connecting the other pole of the first power port (5-1) with the other pole of the second power port (5-2) and The third switch group (5-5); the first switch group (5-3) is a third relay (S3); the second switch group (5-4) includes a first relay (S1) and a series connection On the second relay (S2) on the first relay (S1), the second switch group (5-4) also includes a first diode (D1), a second diode (D2), a first full controlled semiconductor device (K1) and a second fully controlled semiconductor device (K2), the first diode (D1) is connected in parallel to the first relay (S1), and the second diode (D2) is connected in parallel to the second relay (S2), the anode of the first diode (D1) and the anode of the second diode (D2) are connected together and the connection point is connected between the first relay (S1) and the second relay (S2); The first fully-controlled semiconductor device (K1) is connected in parallel on the first diode (D1), and the second fully-controlled semiconductor device (K2) is connected in parallel on the second diode (D2). 4. The modularized bidirectional DC power distribution unit according to claim 1, characterized in that, the bidirectional switch group includes a pole connected to the first power port (5-1) and a pole of the second power port (5-2). The second switch group (5-4) and the third switch group (5-5) of pole; the second switch group (5-4) includes the first relay (S1) and the first relay (S1) in series The second relay (S2), the second switch group (5-4) also includes a first diode (D1), a second diode (D2), a first fully-controlled semiconductor device (K1) and The second fully controlled semiconductor device (K2); the first diode (D1) is connected in parallel on the first relay (S1), the second diode (D2) is connected in parallel on the second relay (S2), the first two The anode of the pole tube (D1) and the anode of the second diode (D2) are connected together and the connection point is connected between the first relay (S1) and the second relay (S2); the first fully-controlled semiconductor device ( K1) is connected in parallel on the first diode (D1), and the second fully controlled semiconductor device (K2) is connected in parallel on the second diode (D2). 5. The modularized bidirectional DC power distribution unit according to any one of claims 2-4, wherein the full-control semiconductor device is an IGBT type. 6. The modularized bidirectional DC power distribution unit according to any one of claims 2-4, wherein the full-control semiconductor device is a MOSFET type. 7. The modularized bidirectional DC power distribution unit according to any one of claims 2-4, wherein the full-control semiconductor device is an IGCT type. 8. The modular bidirectional DC power distribution unit according to claim 1, characterized in that, a plurality of DC positive and negative power lines and signal lines are integrated into pluggable connectors, and installed on the modular bidirectional DC power distribution unit The male pin connector is inserted into the female socket connector on the connection backplane to realize modular plug-in installation; the DC positive power board (4) and the DC negative power board (3) are paired to complete a set of independent Synchronous combination of DC positive power lines and negative power lines, the positive and negative power lines of each DC power module (9) are operated simultaneously. 9 . The modular bidirectional DC power distribution unit according to claim 8 , wherein the pluggable connectors are in pairs, including a male pin connector and a female socket connector. 10. The modular bidirectional DC power distribution unit according to claim 1, characterized in that it also includes a current detection component, the current detection component is arranged on the DC negative power board (3), and the current detection component detects the module The output summary current of the bidirectional DC power distribution unit, and the detected detection signal is output to the application system through the signal port, and used as the current detection signal of the application system.