CN217689127U

CN217689127U - High-precision voltage output type current sensor

Info

Publication number: CN217689127U
Application number: CN202221031275.8U
Authority: CN
Inventors: 高军杰; 付伟; 田新良; 丁永良
Original assignee: Shenzhen Hangzhi Precision Electronics Co ltd
Current assignee: Shenzhen Hangzhi Precision Electronics Co ltd
Priority date: 2022-04-29
Filing date: 2022-04-29
Publication date: 2022-10-28
Anticipated expiration: 2032-04-29

Abstract

The utility model relates to a current detection technical field especially relates to a high accuracy voltage output type current sensor. The technical scheme comprises the following steps: the electronic assembly comprises a mutual inductor and a current-to-voltage board; the mutual inductor is installed in the mutual inductor shell, the current-to-power pressing plate is installed in the current-to-power pressing plate shell, the mutual inductor shell is fixed to the top end of the current-to-power pressing plate shell, the mutual inductor shell is connected with the current-to-power pressing plate shell, and the mutual inductor is connected with the current-to-power pressing plate. The utility model has the advantages of easily realize, the measurement accuracy is high, the practicality is good, has realized voltage output analog signal moreover.

Description

High-precision voltage output type current sensor

Technical Field

The utility model relates to a current detection technical field specifically is a high accuracy voltage output type current sensor.

Background

With the rapid development of new energy electric vehicles, direct current systems mature day by day, and the market demand of high-precision current sensors is huge. However, in the field of high-precision current sensors, foreign related enterprises monopolize for a long time, so that the price is high, and even an analog current signal is output.

The current sensor is a detection device which can sense the information of the current to be detected and convert the sensed information into an electric signal meeting certain standards or other information in required forms according to a certain rule for output so as to meet the requirements of information transmission, processing, storage, display, record, control and the like.

The precision of the existing current sensor cannot reach the standard, and the shielding capability of the current sensor is not strong, so that the performance reliability of the current sensor is not high enough.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a high accuracy voltage output type current sensor to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: a high-precision voltage output type current sensor comprises a structural assembly and an electronic assembly, wherein the structural assembly comprises a mutual inductor shell and a current-to-power pressing plate shell, and the electronic assembly comprises a mutual inductor and a current-to-power pressing plate;

the mutual inductor is installed in the mutual inductor shell, the current-to-voltage board is installed in the current-to-voltage board shell, the mutual inductor shell is fixed on the top end of the current-to-voltage board shell, the mutual inductor shell is connected with the current-to-voltage board shell, and the mutual inductor is connected with the current-to-voltage board.

Preferably, the transformer is a fluxgate current transformer. The fluxgate current transformer converts a primary side large current signal into a secondary side small current signal, the secondary side small current signal passes through a component formed by related circuits and is converted into a proper voltage signal by a current-to-voltage conversion circuit, and the output end of the fluxgate current transformer is connected with the input end of a post-stage circuit.

Preferably, the current-to-voltage board comprises a current sampling circuit, a differential amplifying circuit, a zero setting circuit, a voltage output circuit and a rear-stage circuit, the output end of the mutual inductor is connected with the input end of the current sampling circuit, the output end of the current sampling circuit is connected with the input end of the differential amplifying circuit, the output end of the differential amplifying circuit is connected with the input end of the voltage output circuit, the output end of the voltage output circuit is connected with the input end of the rear-stage circuit, and the zero setting circuit is connected with the differential amplifying circuit.

Preferably, the current sampling comprises a chip U1, the chip U1 and peripheral elements thereof form a differential amplification circuit, and a voltage output circuit is connected behind the differential amplification circuit; the voltage output circuit is connected with a post-stage circuit.

Compared with the prior art, the beneficial effects of the utility model are that: the voltage output type current sensor adopts a high-precision resistance type current sensor and a high-precision differential amplification technology, and can be adjusted to zero outside the shell, and the whole transformer and the current transformation pressing plate are respectively arranged in the metal shell to form a good shielding system, so that the performance reliability of the sensor is greatly improved.

Drawings

Fig. 1 is a schematic view of a high-precision voltage output type current sensor according to the present invention;

fig. 2 is a system block diagram of a high-precision voltage output type current sensor according to the present invention;

fig. 3 is the circuit schematic diagram of the high-precision voltage output type current sensor of the present invention.

In the figure: 10. a structural component; 11. an electronic component; 12. a transformer housing; 13. a current-to-voltage board housing; 14. a transformer; 15. converting current into a voltage plate; 21. current sampling; 22. a differential amplification circuit; 23. a zero setting circuit; 24. a voltage output circuit; 25. and a post-stage circuit.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element to which the reference is made must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "provided," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1 to fig. 3, the present invention provides an embodiment: a high-precision voltage output type current sensor comprises a structural assembly 10 and an electronic assembly 11, wherein the structural assembly 10 comprises a transformer shell 12 and a current-to-voltage plate shell 13, and the electronic assembly 11 comprises a transformer 14 and a current-to-voltage plate 15;

the transformer 14 is a fluxgate current transformer, which converts a large current signal on a primary side into a small current signal on a secondary side, converts the large current signal into a suitable voltage signal through a component formed by a related circuit and a current-to-voltage conversion circuit, and has an output end connected to an input end of the subsequent circuit 25.

The mutual inductor 14 is installed in the mutual inductor shell 12, and the current changes the clamp plate 15 and installs in the current changes the clamp plate shell 13, and the mutual inductor shell 12 is fixed on the top of current changes the clamp plate shell 13, and the mutual inductor shell 12 links to each other with current changes the clamp plate shell 13, and the mutual inductor 14 links to each other with current changes the clamp plate 15.

Referring to fig. 2, the current-to-voltage board 15 includes a current sample 21, a differential amplifier circuit 22, a zeroing circuit 23, a voltage output circuit 24 and a post-stage circuit 25, an output terminal of the transformer 14 is connected to an input terminal of the current sample 21, an output terminal of the current sample 21 is connected to an input terminal of the differential amplifier circuit 22, an output terminal of the differential amplifier circuit 22 is connected to an input terminal of the voltage output circuit 24, an output terminal of the voltage output circuit 24 is connected to an input terminal of the post-stage circuit 25, and the zeroing circuit 23 is connected to the differential amplifier circuit 22.

Referring to fig. 3, the current sample 21 includes a chip U1, the chip U1 and its peripheral components form a differential amplifier circuit 22, and the differential amplifier circuit 22 is connected to a voltage output circuit 24; the voltage output circuit 24 is connected to a subsequent stage circuit 25.

The working principle is as follows: the voltage output type current sensor adopts a high-precision resistance type current sensor and a high-precision differential amplification technology, and can be adjusted to zero outside the shell, and the whole mutual inductor 14 and the current-to-voltage plate 15 are respectively arranged in the mutual inductor shell 12 and the current-to-voltage plate shell 13 to form a good shielding system, so that the performance reliability of the sensor is greatly improved.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. A high-precision voltage output type current sensor comprising a structural component (10) and an electronic component (11), characterized in that: the structural assembly (10) comprises a transformer shell (12) and a current-to-voltage board shell (13), and the electronic assembly (11) comprises a transformer (14) and a current-to-voltage board (15);

the transformer (14) is installed in a transformer shell (12), a current-to-voltage board (15) is installed in the current-to-voltage board shell (13), the transformer shell (12) is fixed on the top end of the current-to-voltage board shell (13), the transformer shell (12) is connected with the current-to-voltage board shell (13), and the transformer (14) is connected with the current-to-voltage board (15).

2. A high-precision voltage output type current sensor according to claim 1, wherein: the transformer (14) adopts a flux gate current transformer.

3. A high accuracy voltage output type current sensor according to claim 1, wherein: the current-to-voltage board (15) comprises a current sampling circuit (21), a differential amplifying circuit (22), a zero setting circuit (23), a voltage output circuit (24) and a rear-stage circuit (25), the output end of the mutual inductor (14) is connected with the input end of the current sampling circuit (21), the output end of the current sampling circuit (21) is connected with the input end of the differential amplifying circuit (22), the output end of the differential amplifying circuit (22) is connected with the input end of the voltage output circuit (24), the output end of the voltage output circuit (24) is connected with the input end of the rear-stage circuit (25), and the zero setting circuit (23) is connected with the differential amplifying circuit (22).

4. A high-precision voltage output type current sensor according to claim 3, wherein: the current sampling circuit (21) comprises a chip U1, the chip U1 and peripheral elements of the chip U1 form a differential amplification circuit (22), and a voltage output circuit (24) is connected behind the differential amplification circuit (22); the voltage output circuit (24) is connected with a post-stage circuit (25) after that.