CN109068525A - A kind of standard PC case structure of DC-DC power module - Google Patents

Abstract

The present invention relates to the field of power module chassis structure, in particular to a standard chassis structure of a DC-DC power module, characterized in that the chassis includes a left side cover, a right side cover, a main box body and a cover plate, and the chassis structure is compact, It is easy to disassemble; the wiring port on the left cover has a lock, which can achieve the effect of anti-touch and quick plug-in; the main box is equipped with a support frame, and the support frame is equipped with a PCB mounting plate, and the insulating partition is connected with the PCB mounting plate The main box body is divided into upper and lower chambers, and the heat dissipation effect is good; the circuit board is installed on the top of the PCB installation board, and the PCB installation board and the circuit board are connected with screws, and the ends of the screws are all installed in the screw caps, and the insulation effect is good; The secondary line between the circuit boards and the power line of the connection port are connected at the upper cavity of the main box body and fixed with cable ties, which has a good anti-interference effect.

Description

A standard chassis structure of DC-DC power module

technical field

The invention relates to the field of chassis structure of a power module, in particular to a standard chassis structure of a DC-DC power module.

Background technique

The DC-DC power module is a bidirectional inverter that can convert the direct current of the battery into direct current to feed energy to the grid, and charge the battery with alternating current for energy storage. It can save users a lot of electricity bills when the user's electricity consumption is in the mode of peak and valley power consumption difference, power distribution according to capacity or power distribution according to demand. But at present, for the 60kw PCS (energy storage converter) DC-DC power module existing on the market, there are still many unreasonable places in its structural layout, such as poor heat dissipation, uncompact space utilization, and waterproof level. low and high overall cost,

In particular, in the prior art, there is an authorized announcement date of 2017.09.05, and the authorized announcement number is CN206472039 U utility model patent "A Power Unit for Inverters", which discloses a power unit, including a chassis, and its PCB The board is fixed on the chassis, the power integration device and the capacitor unit are welded on the PCB board, and the capacitor unit is connected in parallel between the DC+ pole and the DC- pole of the power integration device through stacked busbar wiring, and the radiator is fixed on the On the integrated device and located in the cooling air duct of the chassis, the power unit has a simple and compact structure. However, the structure of the power unit is not layered, resulting in direct contact between the inner PCB board and the cooling air duct, so that the anti-interference performance is not good. The service life of components; in addition, the input and output terminals on the power integration module of the power unit have no anti-touch function.

Contents of the invention

The invention provides a standard case structure of a DC-DC power module, which is used to solve the unreasonable layout of the power module case in the prior art.

In order to solve the above problems, the present invention provides the following technical solutions:

A standard case structure of a DC-DC power module, the case includes a main box body, and a left cover and a right side cover arranged at both ends of the main box body, characterized in that,

The main box body is provided with a PCB mounting plate and an insulating partition for installing the circuit board, and the insulating partition and the PCB mounting plate are connected by screws to separate the inner space of the main box body into an upper cavity and a lower cavity; wherein,

The upper cavity is provided with a circuit board;

The lower cavity is provided with a relay electrically connected to the circuit board, a fuse, a pre-charging resistor, a filter capacitor and a radiator;

A fan is provided on the right side cover at a position opposite to the lower cavity;

An air hole is provided on the left side cover at a position opposite to the lower cavity.

Preferably, a support frame for fixing the PCB mounting board is also provided in the main box body;

The supporting frame includes several supporting bars for supporting and fixing the PCB installation board, and supporting feet for connecting with the inner wall of the main box.

Preferably, the several support bars are arranged parallel to each other.

Preferably, the circuit board is connected to the PCB mounting board by using screws, and screw caps are provided at the ends of the screws.

Preferably, a wiring port is provided at the position where the left side cover is opposite to the upper cavity;

The power line of the connection port and the secondary line of the circuit board are located in the upper cavity.

Preferably, the wiring ports include a battery input positive port, a battery input negative port, a bus output positive port, a bus output negative port, and a CAN communication port.

Preferably, locks are provided on the positive battery input port, the negative battery input port, the positive output port of the bus bar and the negative output port of the bus bar.

Preferably, the circuit board includes a power board, a power auxiliary board, an input and output board, a control board, and a charge and discharge control board.

Preferably, the insulating partition is L-shaped.

As a preference, the filter capacitor and the radiator are installed on the lower part of the PCB mounting board, and in the lower cavity along the direction from the left cover to the right cover, there are filter capacitors and radiators in sequence;

The relay, fuse, and pre-charging resistor are installed on the lower part of the insulating partition, and they are relay, fuse, and pre-charging resistor in sequence from top to bottom.

Compared with the prior art, the present invention has the following advantages:

1. The structure is compact, the front and right side covers, the main box body and the cover plate can be disassembled, and can be fixed with screws, which is convenient for installation and maintenance. When installing the electrical components of the front, right side cover and main box body, you can Separate different places, multiple people work at the same time, improve production efficiency.

2. The internal structure of the DC-DC power module is divided into two parts. The lower cavity is mainly divided into cooling air ducts, and the upper cavity is mainly circuit boards (power board, power auxiliary board, input and output board, control board and charge and discharge control board). board), separated by a PCB mounting board and an insulating partition in the middle, which can prevent dust accumulation in the upper cavity, and the IP protection level is high, up to IP5X level; the secondary line between the circuit boards and the power line between the wiring ports The upper cavity has strong anti-interference performance; the wind is guaranteed to pass through the lower cavity without air leakage and good heat dissipation, which is beneficial to prolong the service life of electrical components on the circuit board.

3. The screws on the circuit board and the PCB installation board are less than 4mm, but the height of the chassis has a limited size, and some circuits on the PCB have high-voltage parts, and the insulation distance is not enough. Now use the screw cap to install all the screw ends in the screw cap, so that The purpose of insulation can be achieved, and the structural space utilization rate is high.

4. The battery input positive port, battery input negative port, bus bar output positive port, bus bar output negative port and CAN communication port on the left cover can all be plugged and unplugged quickly. The battery input positive port on the left cover, the battery The four wiring ports, input negative port, bus output positive port, and bus output negative port, have locks, which can achieve anti-touch and quick plug-in effects, providing safety and reliability guarantee for production staff and operators.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the present invention;

Fig. 2 is a schematic diagram of the reverse structure of the left side cover of the present invention;

Fig. 3 is a schematic diagram of the wiring port structure of the present invention;

Fig. 4 is a schematic diagram of the structure of the lower cavity of the main box body of the present invention;

Fig. 5 is a schematic diagram of the structure of the upper cavity of the main box body of the present invention;

Fig. 6 is the internal layered structure of the present invention except main components;

Fig. 7 is a schematic diagram of the structure of the right side cover of the present invention;

The reference signs are respectively:

Chassis—1, Left Cover—2. Right Cover—3, Main Box—4, Cover—5, Relay—6, Fuse—7, Precharge Resistor—8, Filter Capacitor—9, Radiator— 10. Insulation partition—11, circuit board—12, PCB mounting board—13, support frame—14, battery input positive port—15, battery input negative port—16, bus output positive port—17, bus output negative port— 18. CAN communication port - 19, lock - 20, interface board - 21, air hole - 22, fan - 23, wire cover - 24, switch - 25.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

As shown in Figures 1-6, the present invention provides a standard chassis structure for DC-DC power modules, including a chassis 1, the chassis includes a left side cover 2, a right side cover 3, a main box body 4 and a cover plate 5, and the chassis 1 The specific installation method is as follows:

First install the relay 6, the fuse 7, the pre-charging resistor 8, the filter capacitor 9 and the radiator 10 on the bottom of the main box body 4; secondly, install the grommet 24 and the circuit board 12 including the power board, the control board, and the charging and discharging control board. Board, power supply auxiliary board and input and output board are installed on the PCB installation board 13, are fixed on the support frame 14 together, fan 23 is installed on the right side cover 3, and wiring port includes battery input positive pole port 15, battery input negative pole port 16. Bus output positive port 17, bus output negative port 18 and CAN communication port 19 are installed on the left cover 2; after these installations are completed, connect the secondary connection line between the internal circuit boards and the power line of the wiring port , After these lines are connected, fix them with cable ties. After completing these, install the insulating partition 11, and finally install the cover plate 5.

The cabinet of the present invention adopts an open structure with a compact structure. The left side cover 2, the right side cover 3, the main box body 4 and the cover plate 5 can all be disassembled, and can be fixed with screws, which is convenient for installation and maintenance. After installing the left side cover 2 , When the electrical components of the right side cover 3 and the main box body 4 are separated, different places can be separated, and multiple people can work at the same time to improve production efficiency.

As shown in Figure 1-3, the lower part of the left side cover 2 is provided with air holes, and the wiring ports include battery input positive port 15, battery input negative port 16, bus output positive port 17 and bus output negative port 18 installed in the air hole 22 On the upper end, the connection port is divided into a male connection port and a female connection port. The female connection port is connected to the inside of the box, and the male connection port is connected to the outside through wiring. One side of each connection port is also equipped with a lock 20 , in order to achieve anti-touch and quick plug-in effects, and provide safety and reliability guarantee for production employees and operators. The CAN communication port 19 and LED lights are installed on the interface board 21, and the interface board 21 is installed on the upper part of the left cover 2. The switch Installed on the top of the left side cover 2, wherein the CAN communication port 19 is used for communication and signal output.

As shown in Figures 4-6, a support frame 14 is provided in the main box body 4, and the support frame 14 is placed in the middle of the main box body 4. The support frame includes 3 support bars for supporting and fixing the PCB mounting board, and The two supporting feet used to connect with the inner wall of the main box, and the three supporting bars are arranged parallel to each other. A PCB mounting plate 13 is housed on the support frame 14, and the insulating partition 11 is connected with the PCB mounting plate 13 and the main box body 4 is divided into upper and lower chambers. The cavity is completely separated to ensure that the wind flows from the lower cavity, and the heat dissipation effect is good.

In the upper cavity of the main box body 4: the circuit board includes a power board, a control board, a charge and discharge control board, an input and output board and a power supply auxiliary board, and the functions of each board are as follows:

Power board: responsible for power control and boosting;

Control board: responsible for voltage and current sampling, PWM control, communication;

Charge and discharge control board: responsible for communicating with the battery BMS;

Input and output board: total current sampling, pre-charging function, input filtering;

Auxiliary power board: responsible for the power supply of the whole system;

There are 3 power boards, which are connected by copper bars and fixed on the upper part of the PCB installation board (the part near the right side cover), the charging and discharging control board and the input and output board are fixed on the middle part of the PCB installation board, and the control board and the power supply auxiliary board are fixed On the lower part of the PCB mounting board (the part near the left cover), the battery input positive terminal 15 is connected to the input and output board through a relay, fuse and pre-charging resistor, the battery input negative terminal 16 is connected to the input and output board, and the bus output positive terminal 17 and bus bar output negative terminal 18 are respectively connected to the copper bars on the power board, the switch 25 and the fan 23 are respectively connected to the auxiliary power board, the relay 6 is also connected to the control board, and the interface board 21 is connected to the charge and discharge control board and the control board; PCB The mounting plate 13 is connected to the circuit board 12 with screws, and the ends of the screws are all installed in the screw caps, which can achieve the purpose of insulation and high structural space utilization; in addition, the left side of the control board and the right side of the auxiliary power board Two grommets 24 are provided respectively, and the grommets 24 have the function of preventing the wire harness from being scratched and reducing the loss of the air volume of the air duct in the lower cavity.

In the lower cavity of the main box body 4: the radiator 10 is fixed on the lower part of the power board, and the filter capacitor 9 is installed on the lower part of the charge and discharge control board and connected to the charge and discharge control board through wiring; The lower part of the partition, from top to bottom, is a relay, a fuse, and a pre-charging resistor. The relay 6 is fixed to the bottom of the main box body 4 through a relay fixing piece, and the fuse 7 is fixed to the bottom of the main box body 4 through an insulating column. The resistor 8 is fixed on the bottom of the main box body 4 . The lower cavity is used as a heat dissipation air duct, which has no air leakage and good heat dissipation effect, which is beneficial to prolonging the service life of the electrical components on the circuit board 12, and can also prevent the upper cavity from accumulating dust, and has a high IP protection level.

The secondary line between the circuit boards 12 and the power line of the wiring port are connected in the upper cavity of the main box body 4 through the wire sheath 24, and are fixed with cable ties, which has strong anti-interference performance.

As shown in Figure 7, the right side cover 3 has three fans 23 arranged on the right side cover 3 opposite to the lower cavity, and the air holes 22 are directly opposite to the fans 23, so that the heat dissipation effect is good.

The specific embodiments of the invention have been described in detail above, but they are only examples, and the present invention is not limited to the specific embodiments described above. For those skilled in the art, any equivalent modifications or substitutions to the invention are also within the scope of the present invention, therefore, equivalent transformations, modifications and improvements made without departing from the spirit and scope of the present invention etc., should be covered within the scope of the present invention.

Claims (10)

1. A standard chassis structure of DC-DC power module, the chassis includes the main box body, and sets up left side cap and right side cap at the main box body both ends, characterized by that,

the main box body is internally provided with a PCB mounting plate and an insulating partition plate which are used for mounting a circuit board, and the insulating partition plate is connected with the PCB mounting plate through screws to divide the inner space of the main box body into an upper cavity part and a lower cavity part; wherein,

the upper cavity part is provided with a circuit board;

the lower cavity part is internally provided with a relay, a fuse, a pre-charging resistor, a filter capacitor and a radiator which are electrically connected with the circuit board;

a fan is arranged on the right side cover and opposite to the lower cavity part;

and the left side cover is provided with an air hole at a position opposite to the lower cavity part.

2. The standard chassis structure of a DC-DC power module of claim 1, wherein a support frame for fixing the PCB mounting plate is further provided in the main case;

the support frame includes a plurality of support bars that are used for supporting and fixing the PCB mounting panel and be used for with the spike of main box body inner wall connection.

3. The modular cabinet structure of claim 2, wherein the support bars are disposed parallel to each other.

4. The standard chassis structure of a DC-DC power module of claim 2, wherein the circuit board is connected to the PCB mounting board by screws, and the ends of the screws are provided with screw caps.

5. The modular cabinet structure of a DC-DC power module according to claim 1, wherein a wiring port is provided at a position of the left cover opposite to the upper cavity portion;

and the power line of the wiring port and the secondary line of the circuit board are both positioned in the upper cavity part.

6. The modular chassis structure of a DC-DC power module of claim 5, wherein the wiring ports include a battery input positive port, a battery input negative port, a bus output positive port, a bus output negative port, and a CAN communication port.

7. The modular chassis structure of a DC-DC power module of claim 6, wherein the positive battery input port, the negative battery input port, the positive bus output port and the negative bus output port are provided with latches.

8. The modular chassis structure of a DC-DC power module of claim 1, wherein the circuit board comprises a power board, a power auxiliary board, an input/output board, a control board, and a charging/discharging control board.

9. The modular cabinet structure for a DC-DC power module as claimed in claim 1, wherein the insulating partition is L-shaped.

10. The standard chassis structure of a DC-DC power module of claim 1, wherein the filter capacitor and the heat sink are mounted at the lower part of the PCB mounting board, and the filter capacitor and the heat sink are sequentially arranged in the lower cavity part along the direction from the left cover to the right cover;

the relay, the fuse and the pre-charging resistor are arranged on the lower portion of the insulating partition plate and sequentially arranged from top to bottom.