CN214900786U

CN214900786U - Collection flow box

Info

Publication number: CN214900786U
Application number: CN202120582390.3U
Authority: CN
Inventors: 柯建兴
Original assignee: Sineng Electric Co ltd
Current assignee: Sineng Electric Co ltd
Priority date: 2021-03-22
Filing date: 2021-03-22
Publication date: 2021-11-26
Anticipated expiration: 2031-03-22

Abstract

The utility model is suitable for a photovoltaic inverter field provides a combiner box, including the quick-witted case, be equipped with the mounting panel in the quick-witted case, the middle part of mounting panel is equipped with output circuit breaker, one side of mounting panel is equipped with anodal input fuse, the opposite side of mounting panel is equipped with negative pole input fuse, output circuit breaker respectively with anodal input fuse and negative pole input fuse electric connection; the circuit board is arranged above the positive input fuse, an anti-reverse diode and a current detection device which are packaged independently are arranged on the circuit board, and the anti-reverse diode is connected with the current detection device and the positive input fuse in series. The utility model discloses a collection flow box will prevent that the anti-diode encapsulates alone to prevent after will encapsulating anti-diode and current detection device setting on same circuit board, saved the space, and the cost is reduced has improved space utilization.

Description

Collection flow box

Technical Field

The utility model belongs to the photovoltaic inverter field especially relates to a collection flow box.

Background

The junction box can be used in a solar photovoltaic power generation system, namely a solar junction box, a solar photovoltaic junction box, a photovoltaic array lightning protection junction box, a solar power generation junction box, a photovoltaic power generation junction box and a photovoltaic lightning protection junction box. In a solar photovoltaic power generation system, a junction box is used in order to reduce the wiring between a solar photovoltaic cell array and an inverter. Usually, a user can connect a certain number of photovoltaic cells with the same specification in series to form a photovoltaic array, then connect a plurality of photovoltaic arrays in parallel to a photovoltaic junction lightning protection box, and after the photovoltaic junction lightning protection box is internally connected with a junction lightning protection box, the photovoltaic junction lightning protection box is matched with a controller, a direct current power distribution cabinet, a photovoltaic inverter and an alternating current power distribution cabinet to form a complete photovoltaic power generation system, so that grid connection with a mains supply is realized.

In order to prevent the situation that the input end of the junction box is positioned at the same side and leads to wiring errors easily, an anti-reverse diode module is generally adopted in the junction box, the cost of a modularized diode is high, and in addition, current detection is also carried out independently, so that the space utilization rate is low and the cost is high.

SUMMERY OF THE UTILITY MODEL

An embodiment of the utility model provides a collection flow box aims at solving current collection flow box space utilization and low and the higher problem of cost.

The embodiment of the utility model provides a thus realized, provide a combiner box, including the quick-witted case, be equipped with the mounting panel in the quick-witted case, the middle part of mounting panel is equipped with output circuit breaker, one side of mounting panel is equipped with anodal input fuse, the opposite side of mounting panel is equipped with negative pole input fuse, output circuit breaker respectively with anodal input fuse and negative pole input fuse electric connection; the circuit board is arranged above the positive input fuse, an anti-reverse diode and a current detection device which are packaged independently are arranged on the circuit board, and the anti-reverse diode is connected with the current detection device and the positive input fuse in series.

Furthermore, the monitoring device also comprises a monitoring unit, wherein the monitoring unit comprises an MCU control system for acquiring data signals and an upper computer connected with the MCU control system, and the MCU control system is in communication connection with the upper computer through an RS485 communication interface; the MCU control system is electrically connected with the current detection device and the output circuit breaker respectively; the MCU control system comprises an optical fiber isolator, and data signals acquired by the MCU control system are isolated and converted by the optical fiber isolator to obtain safe RS485 communication signals.

Furthermore, a ceramic substrate is arranged between the anti-reverse diode and the radiator, the anti-reverse diode is in compression joint with the ceramic substrate through a spring pressing sheet, and the ceramic substrate is pressed on the radiator.

Furthermore, the monitoring unit further comprises an isolation power supply for realizing 1500V high-voltage input and 5V output, and the isolation power supply supplies power to the MCU control system.

Furthermore, a lightning protection device is further arranged on the mounting plate and electrically connected with the MCU control system.

Furthermore, the current detection device comprises a Hall current sensor arranged on each direct current input branch of the positive pole.

Further, the parameters of the anti-reverse diode are 3000V/30A, and the TO247 is adopted for packaging.

Furthermore, a grounding terminal is arranged below the output circuit breaker, and a grounding wire port is arranged at the position of the bottom of the case corresponding to the grounding terminal.

Furthermore, a positive input port is arranged at the bottom of the case corresponding to the positive input fuse, and a negative input port is arranged at the bottom of the case corresponding to the negative input fuse; the bottom of the case is also provided with two output ports.

Furthermore, the positive input fuses comprise an upper row of positive input fuses and a lower row of positive input fuses, and the circuit board is arranged above the two rows of positive input fuses; the negative input fuse comprises an upper row of negative input fuses and a lower row of negative input fuses.

The combiner box comprises a case, wherein a mounting plate is arranged in the case, an output circuit breaker is arranged in the middle of the mounting plate, an anode input fuse is arranged on one side of the mounting plate, a cathode input fuse is arranged on the other side of the mounting plate, and the output circuit breaker is electrically connected with the anode input fuse and the cathode input fuse respectively; the circuit board is arranged above the positive input fuse, an anti-reverse diode and a current detection device which are packaged independently are arranged on the circuit board, and the anti-reverse diode is connected with the current detection device and the positive input fuse in series. The utility model discloses a collection flow box will prevent that the anti-diode encapsulates alone to prevent after will encapsulating anti-diode and current detection device setting on same circuit board, saved the space, and the cost is reduced has improved space utilization.

Drawings

FIG. 1 is a schematic structural view of a header box according to the present invention;

fig. 2 is another schematic structural diagram of the junction box of the present invention.

Description of the reference numerals

10. A chassis; 11. a negative input port; 12. a positive input port; 13. an output port; 14. a communication line port; 15. a ground line port;

20. an output breaker; 30. a positive input fuse; 40. a negative input fuse; 50. a circuit board; 60. a monitoring unit; 70. a lightning protection device; 80. a heat sink; 90. a cabinet door; 91. and (5) locking.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The utility model provides a combiner box, which comprises a case 10, wherein a mounting plate is arranged in the case 10, an output circuit breaker 20 is arranged in the middle of the mounting plate, an anode input fuse 30 is arranged on one side of the mounting plate, a cathode input fuse 40 is arranged on the other side of the mounting plate, and the output circuit breaker 20 is respectively electrically connected with the anode input fuse 30 and the cathode input fuse 40; a circuit 50 board is arranged above the positive input fuse 30, an anti-reverse diode and a current detection device which are packaged independently are arranged on the circuit board 50, and the anti-reverse diode is connected in series with the current detection device and the positive input fuse 30. The utility model discloses a collection flow box will prevent that the anti-diode encapsulates alone to prevent after will encapsulating anti-diode and current detection device setting on same circuit board 50, saved the space, and the cost is reduced has improved space utilization.

Example one

The utility model provides a combiner box, which comprises a case 10, wherein a mounting plate is arranged in the case 10, an output circuit breaker 20 is arranged in the middle of the mounting plate, an anode input fuse 30 is arranged on one side of the mounting plate, a cathode input fuse 40 is arranged on the other side of the mounting plate, and the output circuit breaker 20 is respectively electrically connected with the anode input fuse 30 and the cathode input fuse 40; a circuit 50 board is arranged above the positive input fuse 30, an anti-reverse diode and a current detection device which are packaged independently are arranged on the circuit board 50, and the anti-reverse diode is connected in series with the current detection device and the positive input fuse 30.

In the present embodiment, the anti-reverse diode and the current detection device are integrated on a circuit board 50, and the pin of the anti-reverse diode is soldered to the circuit board 50.

Further, a ceramic substrate is disposed between the anti-reflection diode and the heat sink 80 at the bottom thereof, and in the embodiment, the ceramic substrate is pressed against the heat dissipation surface of the anti-reflection diode by a spring pressing sheet.

Further, parameters of the anti-reverse diode are voltage 3000V and current 30A, and the package is performed by using TO 247. The embodiment packages the anti-reverse diode, and saves space and reduces cost compared with the existing anti-reverse diode module.

Further, the current detection device comprises Hall current sensors arranged on each direct current input branch of the positive pole. In this embodiment, each positive dc input branch is provided with a hall current sensor, the hall current sensor is connected to the positive input fuse 30, and the current detection is isolated by the hall current sensor, thereby ensuring the insulation between the MCU control system and the PV high voltage system.

The bus box of the embodiment integrates the anti-reverse diode and the current detection device on one circuit board, and the anti-reverse diode is independently packaged, so that the cost of the bus box is reduced, the space is saved, and the space utilization rate of the bus box is improved.

Example two

On the basis of the first embodiment, the embodiment of the utility model provides a combiner box, still include the monitoring unit 60, the monitoring unit 60 includes the MCU control system that is used for gathering data signal, and the host computer of being connected with the MCU control system, the MCU control system is connected with the host computer communication through RS485 communication interface; the MCU control system is respectively connected with the current detection device and the output breaker 20;

the MCU control system comprises an optical fiber isolator, and data signals acquired by the MCU control system are isolated and converted by the optical fiber isolator to obtain safe RS485 communication signals.

Further, the monitoring unit 60 further includes an isolation power supply for supplying power to the MCU control system, and the isolation power supply realizes 1500V high voltage input and 5V output. Specifically, a transformer winding in the isolation power supply is wound by adopting an output three-layer insulated wire, a flying wire is led out and then welded to a circuit board, and the circuit board is subjected to grooving treatment to ensure that the creepage distance is more than 30 mm. The isolation power supply is used for supplying power to the safety interface, such as an RS485 communication interface and a digital trunk node. Make inside detected signal (including 1500V high voltage detection, branch road current detection, digital dry contact detected signal) accomplish 1500V with outside RS485 communication signal homoenergetic and strengthen insulating to accomplish the transmission of control data, realize creepage distance 30mm, satisfy safety standard's requirement.

In this embodiment, the data signal includes the bus voltage, the positive dc input branch current, and the data signal of the output breaker. The MCU control system is connected with the isolation power supply, on one hand, the MCU control system is provided with a power supply, and on the other hand, the bus voltage can be collected. The MCU control system is electrically connected with the current detection device to collect the current on each direct current input branch of the anode; in addition, data signals of the output circuit breaker are collected through the digital trunk node interface.

In this embodiment, the specific types of the optical fiber isolator are: AFBR-390525RZ, CTI is more than or equal to 600, and PCB grooving treatment is carried out. And the data signals acquired by the MCU control system are isolated and converted by the optical fiber isolator to obtain standard RS485 signals. The RS485 signal after being isolated by the optical fiber is in accordance with the safety standard, and can be directly touched by a human body. The output RS485 standard signal is connected with an upper computer through a communication interface 61.

Further, the mounting plate is further provided with a lightning protection device 70 electrically connected with the MCU control system. Specifically, the MCU control system is connected to the lightning protection device 70 through the digital trunk node interface for collecting signals of the lightning protection device.

In this embodiment, the MCU control system obtains standard RS485 signals from the collected data signals, including voltage signals, current signals, output breaker signals, and lightning protection signals, through isolation and conversion by the fiber isolator. The RS485 communication signal of standard passes through communication interface 61 and is connected with the host computer, and accomplish 1500V between the detected signal and strengthen insulating, accomplish the transmission of control data, realize creepage distance 30mm, satisfy safety standard's requirement.

The header box of this embodiment is through setting up independent monitoring unit 60 to the high-pressure data signal that MCU control system gathered obtains standard safe RS485 communication signal through fiber isolator isolation conversion, through RS485 communication interface and host computer connection. The 1500V reinforced insulation can be achieved between the external RS485 communication signal and the high-voltage input, the external communication interface is safe and reliable, a human body can be directly touched, and the safety standard is improved.

EXAMPLE III

On the basis of the first or second embodiment, the present embodiment provides a junction box, and a grounding terminal is arranged below the output breaker and used for connecting a ground wire.

In this embodiment, a ground wire port 15 is provided at a position of the bottom of the chassis corresponding to the ground terminal for receiving a ground wire.

In this embodiment, a communication line port 14 is further disposed at a position of the bottom of the chassis corresponding to the RS485 communication interface 61, so as to access a communication network.

Furthermore, a positive input port 12 is arranged at the bottom of the case and at a position corresponding to the positive input fuse, and is used for accessing a direct current input positive electrode; and a negative input port 11 is arranged at the bottom of the case and at a position corresponding to the lower part of the negative input fuse, and is used for connecting a direct current input negative electrode.

In this embodiment, two output ports 13 are further disposed at the bottom of the chassis between the positive input port and the negative input port, and are respectively used for connecting a dc output positive electrode and a dc output negative electrode.

Specifically, the positive input port 12, the negative input port 11, the output port 13, the ground cable port 15, and the communication cable port 14 are configured by a glan head, so as to implement routing of the input/output cable, the ground cable, and the communication cable.

Further, the positive input fuse 30 includes upper and lower rows of fuses, and a circuit board 50 is disposed above both rows of fuses; the negative input fuse 40 includes upper and lower rows of fuses.

In this embodiment, there are 20 positive input fuses 30, and 10 positive input fuses 30 are provided in the upper and lower rows because of the space requirement of the combiner box. And circuit boards 50 are arranged above the two rows of positive input fuses, and anti-reverse diodes and current detection devices are arranged on the circuit boards 50. Similarly, there are 20 negative input fuses 40, and 10 negative input fuses 40 are provided in two rows, one above the other.

In other embodiments, the number of the positive and negative input fuses is determined according to the internal space setting of the combiner box and the requirements of the positive and negative input branches, and the positive and negative input fuses can be arranged in one row or multiple rows according to actual requirements.

Further, the combiner box further comprises a box door 90 for closing the combiner box, and the box door 90 is provided with an upper lock catch 91 and a lower lock catch 91, so that the box door 90 cannot be shaken after the door is locked.

In this embodiment, the casing door 90 is further provided with a waterproof sealing strip 92 around to seal the junction box, so as to prevent the junction box from entering water when used outdoors.

Further, a guide rail groove is also formed in the cabinet door 90, a guide rail is arranged on the cabinet at a position corresponding to the guide rail, and when the cabinet door 90 is closed, the guide rail on the cabinet is matched with the guide rail groove to close the cabinet door 90; be used for fixed machine chamber door 90 when the start chamber door, prevent that the machine chamber door from rocking in maintenance process, influencing the operation.

The utility model discloses a collection flow box will prevent that anti-diode encapsulates, has reduced the collection flow box cost, will prevent in addition that anti-diode and current detection device are integrated on a circuit board, have practiced thrift the space, have improved the space utilization who converges the flow box. An independent monitoring unit is arranged, and a high-voltage data signal acquired by the MCU control system is isolated and converted by an optical fiber isolator to obtain a standard RS485 signal, and is connected with an upper computer through an RS485 communication interface; the inside detected signal of the collection flow box of this embodiment can accomplish 1500V between with outside RS485 communication signal and strengthen insulating, ensures that external RS485 communication interface is safe and reliable, and the human body can direct touch, has improved the safety standard.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. A combiner box, comprising:

the circuit breaker comprises a case, wherein a mounting plate is arranged in the case, an output circuit breaker is arranged in the middle of the mounting plate, a positive input fuse is arranged on one side of the mounting plate, a negative input fuse is arranged on the other side of the mounting plate, and the output circuit breaker is electrically connected with the positive input fuse and the negative input fuse respectively;

the circuit board is arranged above the positive input fuse, an anti-reverse diode and a current detection device which are packaged independently are arranged on the circuit board, and the anti-reverse diode is connected with the current detection device and the positive input fuse in series.

2. The combiner box of claim 1,

the monitoring unit comprises an MCU control system for acquiring data signals and an upper computer connected with the MCU control system, and the MCU control system is in communication connection with the upper computer through an RS485 communication interface; the MCU control system is electrically connected with the current detection device and the output circuit breaker respectively;

3. The combiner box of claim 1,

a ceramic substrate is arranged between the anti-reverse diode and the radiator, the anti-reverse diode is in compression joint with the ceramic substrate through a spring pressing sheet, and the ceramic substrate is pressed on the radiator.

4. The combiner box of claim 2,

the monitoring unit further comprises an isolation power supply for realizing 1500V high-voltage input and 5V output, and the isolation power supply supplies power to the MCU control system.

5. The combiner box of claim 2,

still be equipped with the lightning protection device on the mounting panel, the lightning protection device with MCU control system electric connection.

6. The combiner box of claim 1,

the current detection device comprises Hall current sensors arranged on each direct current input branch of the anode.

7. The combiner box of claim 1,

the parameters of the anti-reverse diode are 3000V/30A, and TO247 is adopted for packaging.

8. The combiner box of claim 1,

and a grounding terminal is arranged below the output circuit breaker, and a grounding wire port is arranged at the position of the bottom of the case corresponding to the grounding terminal.

9. The combiner box of claim 1,

a positive input port is arranged at the bottom of the case and corresponds to the positive input fuse, and a negative input port is arranged at the bottom of the case and corresponds to the negative input fuse; the bottom of the case is also provided with two output ports.

10. The combiner box of claim 1,

the positive input fuses comprise an upper row of positive input fuses and a lower row of positive input fuses, and the circuit board is arranged above the two rows of positive input fuses;

the negative input fuse comprises an upper row of negative input fuses and a lower row of negative input fuses.