A type of through-hole Hall current sensor

Abstract

This utility model discloses a through-hole Hall current sensor, including a housing, a through-hole fuse, a magnetic ring, a Hall element, a circuit board, pins, contacts, and a socket. The magnetic ring, Hall element, and circuit board are fixed inside the housing. The magnetic ring has an air gap, and the Hall element is located in the air gap. The lower end of the Hall element is connected to the circuit board, and the pins are connected to the circuit board and extend out of the housing. The through-hole fuse passes through the housing and the internal magnetic ring, and both ends of the through-hole fuse are contacts. The socket includes a base plate, a slot, and a pin slot. The contacts are inserted into the slot and are in complete contact with the slot, and the pins are inserted into the pin slot and are in complete contact with the pin slot. In the actual operation and maintenance application of photovoltaic power plants, if a current sensor failure occurs, it can be directly hot-swapped, which greatly improves the operation and maintenance efficiency and reduces the operation and maintenance cost.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic power generation technology, specifically a direct-insertion Hall current sensor. Background Technology

[0002] With rapid socio-economic development, energy and resource consumption is increasing dramatically. Conserving energy and protecting the environment have become essential conditions for sustainable human development. People are strengthening the development and utilization of renewable energy, and solar photovoltaic power generation has become one of the most popular technologies globally.

[0003] A solar photovoltaic (PV) power generation system is a system that directly converts solar radiation energy into electrical energy based on the photovoltaic effect. For example, a 10-megawatt solar PV power station typically consists of a solar PV module array, a combiner box, a DC distribution cabinet, and a grid-connected inverter. During the day when there is sunshine, the electricity generated by the solar panel array is first collected through the combiner box, then distributed through the DC distribution cabinet, and finally directly transmitted to the power grid by the grid-connected inverter.

[0004] Applications such as photovoltaic power plants require high voltage and current. Photovoltaic modules can be connected in series and parallel to aggregate the low voltage and low current generated by each module into high voltage and high current electrical energy. For example, the optimal operating voltage of a certain photovoltaic module is 30 volts and the optimal operating current is 5 amps. The optimal operating voltage of a certain inverter is 600 volts and the optimal operating current is 80 amps. An array of 320 photovoltaic modules can be connected in series in rows of 20, for a total of 16 rows. Each row outputs 600 volts and 5 amps. Then, 16 combiner boxes are used to combine the current (connected in parallel), resulting in an output voltage of 600 volts and an output current of 80 amps, which can match the inverter.

[0005] To monitor the operation of photovoltaic power plants in real time, project sites typically use combiner monitoring units to monitor the current of the photovoltaic strings. Each combiner monitoring unit contains 16 through-hole Hall current sensors. Each string cable passes through the core of a separate Hall current sensor, and each Hall current sensor monitors the current of one string. If a single Hall sensor fails, the current of the corresponding branch string cannot be monitored, and the monitoring unit malfunctions. While the failure rate of a typical Hall current sensor in the field is around 0.3%, with 16 sensors in a single monitoring unit, the failure rate can be as high as 5%. Because 16 cables pass through the monitoring unit, replacement in the field requires complete cable removal, which is extremely time-consuming and labor-intensive, becoming a major pain point in the on-site operation and maintenance of the monitoring unit.

[0006] This utility model relates to a plug-in Hall current sensor, which can be used to monitor the current of photovoltaic strings in real time, and has a fuse protection function. Moreover, it can be directly plugged in and unplugged, which greatly facilitates operation and maintenance and reduces operation and maintenance costs. Utility Model Content

[0007] In view of the shortcomings of the prior art, this utility model provides a through-hole Hall current sensor to solve the problems mentioned in the background art.

[0008] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0009] A through-hole Hall current sensor includes a housing, a through-hole fuse, a magnetic ring, a Hall element, a circuit board, pins, contacts, and a socket. The magnetic ring, Hall element, and circuit board are fixed inside the housing. The magnetic ring has an air gap, and the Hall element is located in the air gap. The lower end of the Hall element is connected to the circuit board, and the pins are connected to the circuit board and protrude from the housing. The through-hole fuse passes through the housing and the magnetic ring inside, and the two ends of the through-hole fuse are contacts. The socket includes a base plate, a slot, and a pin slot. The contacts are inserted into the slot and are in complete contact with the slot. The pins are inserted into the pin slot and are in complete contact with the pin slot.

[0010] Preferably, the through-type fused core consists of a vacuum ceramic shell, a fused wire, and a contact, with the contact plated in silver to reduce contact resistance.

[0011] Preferably, the fuse has a fusing current of 15 amperes.

[0012] Preferably, the substrate is an FR4 polyester sheet.

[0013] Preferably, the card slot is a silver-plated copper card slot.

[0014] Preferably, the pin slot is a silver-plated copper pin slot.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] In the actual operation and maintenance application of photovoltaic power plants, if a current sensor malfunctions, this invention allows for direct hot-swapping, which greatly improves operation and maintenance efficiency and reduces operation and maintenance costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a through-hole Hall current sensor in one embodiment.

[0018] Figure 2 This is a schematic diagram of the internal structure of a through-hole Hall current sensor in one embodiment.

[0019] Figure 3This is a schematic diagram of the through-hole fused core structure of a direct-insertion Hall current sensor in one embodiment.

[0020] Figure 4 This is a schematic diagram of the socket structure of a direct-insertion Hall current sensor in one embodiment.

[0021] In the diagram: 101—outer shell, 102—through-type fuse core, 103—contact, 104—pin, 201—magnetic ring, 202—Hall element, 203—circuit board, 301—ceramic tube shell, 302—fuse, 401—socket, 402—substrate, 403—card slot, 404—pin slot. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Example 1

[0024] Figure 1 This is a schematic diagram of a through-hole Hall current sensor in this embodiment. It includes a housing 101, a through-hole fuse 102, a contact 103, and pins 104. In this embodiment, the through-hole fuse 102 is rated for 1500 DC and 15 Amps. In this embodiment, the contact 103 is a silver-plated copper contact.

[0025] Example 2

[0026] Figure 2 This is a schematic diagram of the internal structure of a through-hole Hall current sensor in this embodiment. It mainly consists of a magnetic ring 201, a Hall element 202, and a circuit board 203. Pins 104 are connected to the bottom of the circuit board. The magnetic ring has an air gap, and the Hall element 202 is located in the air gap and can sense the magnetic field in the magnetic ring. The Hall element 202 is connected to the top of the circuit board 203.

[0027] The through-type fused core 102 passes through the outer shell 101 and through the circular hole in the middle of the magnetic ring 201 inside the outer shell.

[0028] Current is introduced through contact 103 and flows through through-type fuse 102. The current forms a magnetic field inside the magnetic ring 201. After the Hall element 202 senses the magnetic field, it generates a corresponding voltage signal. The voltage signal is processed by the circuit board 203 and finally fed back to the monitoring unit through pin 104, so that the current on the photovoltaic panel can be detected and the purpose of current monitoring can be achieved.

[0029] Example 3

[0030] Figure 3 This is a schematic diagram of the through-hole fuse structure of a direct-insertion Hall current sensor in this embodiment. It mainly consists of a ceramic housing 301, a fuse 302, and a contact 103. In this embodiment, the ceramic housing 301 is a vacuum-sealed ceramic material housing. In this embodiment, the fusing current of the fuse 302 is 15 amperes.

[0031] Example 4

[0032] Figure 4 This is a schematic diagram of the socket structure of a through-hole Hall current sensor in this embodiment. It mainly consists of a substrate 402, a slot 403, and a pin slot 404. In this embodiment, the substrate 402 is made of FR4 polyester board. In this embodiment, the slot 403 is a silver-plated copper slot, which can fully contact the contact 103. In this embodiment, the pin slot 404 is a silver-plated copper pin slot, which can fully contact the pin 104.

[0033] In practical use, the Hall current sensor is directly plugged into the socket 401 in the busbar monitoring unit via pin 104. The current on the photovoltaic panel is introduced through the sensor's contact 103 and flows through the through-type fuse 102. The current forms a magnetic field inside the magnetic ring 201. After the Hall element 202 senses the magnetic field, it generates a corresponding voltage signal. The voltage signal is processed by the circuit board 203 and finally fed back to the monitoring unit through pin 104, thereby detecting the magnitude of the current on the photovoltaic panel and achieving the purpose of current monitoring.

[0034] It should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A direct-insertion Hall current sensor characterized by: The device includes a housing (101), a through-type fused core (102), a magnetic ring (201), a Hall element (202), a circuit board (203), pins (104), contacts (103), and a socket (401). The magnetic ring (201), Hall element (202), and circuit board (203) are fixed inside the housing (101). The magnetic ring (201) has an air gap, and the Hall element (202) is located in the air gap. The lower end of the Hall element (202) is connected to the circuit board (203). Pins (104) It is connected to the circuit board (203) and the pins protrude from the housing; the through-type fuse (102) passes through the housing (101) and the internal magnetic ring (201), and the two ends of the through-type fuse (102) are contacts (103); the socket (401) includes a base plate (402), a card slot (403), and a pin slot (404). The contacts (103) are inserted into the card slot (403) and are in complete contact with the card slot (403). The pins (104) are inserted into the pin slot (404) and are in complete contact with the pin slot (404).

2. The direct-insertion Hall current sensor of claim 1, wherein: The through-type fuse core (102) consists of a vacuum ceramic shell (301), a fuse wire (302), and a contact (103), with the contact (103) plated with silver to reduce contact resistance.

3. A through-hole Hall current sensor according to claim 2, characterized in that: The fuse (302) has a fusing current of 15 amperes.

4. A through-hole Hall current sensor according to claim 3, characterized in that: The substrate (402) is an FR4 polyester sheet.

5. A through-hole Hall current sensor according to claim 4, characterized in that: The card slot (403) is a silver-plated copper card slot.

6. A through-hole Hall current sensor according to claim 5, characterized in that: The pin slot (404) is a silver-plated copper pin slot.

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