CN217007452U

CN217007452U - Current sampling circuit of portable energy storage inversion module

Info

Publication number: CN217007452U
Application number: CN202220309771.9U
Authority: CN
Inventors: 刘丹; 张化伟; 侯松林; 岳丹金
Original assignee: Shenzhen Mengpai Information Technology Co ltd
Current assignee: Shenzhen Mengpai Information Technology Co ltd
Priority date: 2022-02-16
Filing date: 2022-02-16
Publication date: 2022-07-19
Anticipated expiration: 2032-02-16

Abstract

The utility model discloses a current sampling circuit of a portable energy storage inversion module, relates to the technical field of power electronics, and solves the technical problems of large occupied space and high cost of the current sampling circuit in the prior art. The device comprises a current sampling module and a current amplifying module connected with the current sampling module, wherein the current sampling module is provided with a copper foil, and the current is sampled through the copper foil; the current amplification module is used for amplifying the sampled current. The circuit of the utility model has simple structure, small occupied space area and low cost, and has market popularization value.

Description

Current sampling circuit of portable energy storage inversion module

Technical Field

The utility model relates to the technical field of power electronics, in particular to a current sampling circuit of a portable energy storage inversion module.

Background

In a low-voltage high-current sampling circuit (such as an energy storage inverter module), a sampling resistor or a HALL current sensor is often used to realize the collection and detection of current in the circuit, so as to achieve current-limiting protection and EDS protection.

In the process of implementing the utility model, we find that at least the following problems exist in the prior art:

firstly, a plurality of sampling resistors are adopted for sampling and detecting current, so that the occupied space is large, the volume of a product is influenced, and the product is inconvenient to carry;

secondly, the HALL current sensor is expensive, increasing the cost of the product, and not conducive to market promotion.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a current sampling circuit of a portable energy storage inverter module, and aims to solve the technical problems that the current sampling circuit occupies a large space and is high in cost in the prior art. The technical effects that can be produced by the preferred technical scheme of the technical schemes provided by the utility model are described in detail in the following.

In order to achieve the purpose, the utility model provides the following technical scheme:

the utility model provides a current sampling circuit of a portable energy storage inversion module, which comprises a current sampling module and a current amplification module connected with the current sampling module; the current sampling module is provided with a copper foil, and the current of the energy storage inversion module is sampled through the copper foil; the current amplification module is used for amplifying the sampled current.

Preferably, the current sampling module further includes a first resistor R1, a second resistor R2, a first capacitor C1, and a second capacitor C2; two ends of the copper foil are respectively connected with one end of the first resistor R1 and one end of the second resistor R2; the other end of the first resistor R1 and the other end of the second resistor R2 are respectively connected with the two pole plates of the first capacitor C1; one polar plate of the second capacitor C2 is connected with one end of the copper foil, and the other polar plate is grounded.

Preferably, an input end is arranged at the connection position of the copper foil and the first resistor R1, and an input voltage Vin is connected; and an output end is arranged at the joint of the copper foil and the second capacitor C2, and the output voltage of the output end is Vout.

Preferably, the current amplification module includes a differential amplifier EA, a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a third capacitor C3; the input anode of the differential amplifier EA is connected with one end of the third resistor R3, the input cathode thereof is connected with one end of the fourth resistor R4, one end of the fifth resistor R5 and one polar plate of the third capacitor C3, and the output end thereof is connected with the other end of the fifth resistor R5 and the other polar plate of the third capacitor C3; the other end of the third resistor R3 is connected with one end of the first resistor R1 and one polar plate of the first capacitor C1; the other end of the fourth resistor R4 is connected with one end of the second resistor R2 and the other pole plate of the first capacitor C1.

Preferably, the output terminal of the differential amplifier EA outputs a sampled amplified current Isense.

Preferably, the current sampling circuit of the portable energy storage inverter module further comprises a sixth resistor R6 and a fourth capacitor C4; one end of the sixth resistor R6 and one plate of a fourth capacitor C4 are both connected between the input anode of the differential amplifier EA and the third resistor R3; the other end of the sixth resistor R6 and the other plate of the fourth capacitor C4 are both grounded.

The implementation of one of the technical schemes of the utility model has the following advantages or beneficial effects:

the utility model adopts the copper foil wiring as current sampling, and solves the technical problems of large occupied space and high cost caused by sampling by a sampling resistor or HALL for low-voltage and large current. The circuit of this embodiment simple structure, occupation space area are little and with low costs, possess market spreading value.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:

fig. 1 is a structural diagram of a current sampling circuit of a portable energy storage inverter module according to an embodiment of the present invention;

fig. 2 is a circuit diagram of a current sampling circuit of a portable energy storage inverter module according to an embodiment of the present invention.

In the figure: 1. a current sampling module; 10. a copper foil; 2. and a current amplification module.

Detailed Description

In order that the objects, aspects and advantages of the present invention will become more apparent, various exemplary embodiments will be described below with reference to the accompanying drawings, which form a part hereof, and in which are shown by way of illustration various exemplary embodiments in which the utility model may be practiced. The same numbers in different drawings identify the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below do not represent all implementations consistent with the present disclosure. It is to be understood that they are merely examples of processes, methods, apparatus, etc. consistent with certain aspects of the present disclosure as detailed in the appended claims, and that other embodiments may be used or structural and functional modifications may be made to the embodiments set forth herein without departing from the scope and spirit of the present disclosure.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "transverse," and the like are used herein in an orientation or positional relationship as illustrated in the accompanying drawings for convenience in describing the present invention and to simplify description, and are not intended to indicate or imply that the referenced elements must have a particular orientation, be constructed in a particular orientation, and be operated. The terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. The term "plurality" means two or more. The terms "coupled" and "connected" are to be construed broadly and may include, for example, a fixed connection, a removable connection, a unitary connection, a mechanical connection, an electrical connection, a communicative connection, a direct connection, an indirect connection via intermediate media, and may include, but are not limited to, a connection between two elements or an interactive relationship between two elements. The term "and/or" includes any and all combinations of one or more of the associated listed items. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In order to explain the technical solution of the present invention, the following description is made by way of specific examples, which only show the relevant portions of the embodiments of the present invention.

As shown in fig. 1-2, the present invention provides a current sampling circuit of a portable energy storage inverter module, which includes a current sampling module 1 and a current amplifying module 2 connected to the current sampling module 1. The current sampling module 1 is provided with a copper foil 10, and the current of the energy storage inverter module is sampled through the copper foil 10; the current amplification module 2 is used for amplifying the sampled current. According to the utility model, the copper foil wires are used for current sampling, and the equivalent circuit between the copper foil wires AB is formed by connecting the resistor R and the parasitic inductor in series, so that the technical problems of large occupied space (a plurality of sampling resistors need to be connected in parallel) and high cost (a HALL current sensor is expensive) caused by sampling by using the sampling resistor or HALL for low-voltage and large current are solved.

Further, the current sampling module 1 further includes a first resistor R1, a second resistor R2, a first capacitor C1, and a second capacitor C2. Specifically, two ends of the copper foil 10 are respectively connected with one end of a first resistor R1 and one end of a second resistor R2, the other end of the first resistor R1 and the other end of the second resistor R2 are respectively connected with two pole plates of a first capacitor C1, one pole plate of a second capacitor C2 is connected with one end of the copper foil 10, and the other pole plate is grounded. In this way, the first resistor R1 and the second resistor R2 are differential sampling circuit resistors, so as to prevent the copper foil 10 or other electrical components (such as a differential amplifier described below) from being damaged by excessive current, the first capacitor C1 can filter high-frequency interference signals, and the second capacitor C2 can perform ground protection on the current sampling module 1 to filter high-frequency interference. Furthermore, the connection between the copper foil 10 and the first resistor R1 is provided with an input terminal, and is connected to an input voltage Vin. An output end is arranged at the joint of the copper foil 10 and the second capacitor C2, and the output voltage is Vout. The copper foil 10 samples and detects the current between the input and output terminals.

Furthermore, the current amplifying module 2 includes a differential amplifier EA, a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a third capacitor C3. Specifically, the input anode of the differential amplifier EA is connected to one end of the third resistor R3, the input cathode thereof is connected to one end of the fourth resistor R4, one end of the fifth resistor R5 and one pole plate of the third capacitor C3, and the output end thereof is connected to the other end of the fifth resistor R5 and the other pole plate of the third capacitor C3; the other end of the third resistor R3 is connected with one end of the first resistor R1 and one polar plate of the first capacitor C1; the other end of the fourth resistor R4 is connected to one end of the second resistor R2 and the other plate of the first capacitor C1. The output end of the differential amplifier EA outputs sampling amplification current Isense, the sampling amplification current Isense is sampled by a current sampling module 1, amplified by a current amplification module 2, amplified and output through the output end of the differential amplifier EA, and then current detection can be carried out after output. The third resistor R3, the fourth resistor R4, the fifth resistor R5 and the third capacitor C3 are all used for current limiting protection and adjusting amplification factor of the differential amplifier EA.

The current sampling circuit of the portable energy storage inverter module of the embodiment further includes a sixth resistor R6 and a fourth capacitor C4. Specifically, one end of the sixth resistor R6 and one plate of the fourth capacitor C4 are both connected between the input positive electrode of the differential amplifier EA and the third resistor R3, and the other end of the sixth resistor R6 and the other plate of the fourth capacitor C4 are both grounded. The sixth resistor R6 and the fourth capacitor C4 may be used for ground protection of the current amplifying module 2.

In conclusion, the current sampling circuit of the portable energy storage inverter module adopts the copper foil wiring for current sampling, and the technical problems of large occupied space and high cost caused by sampling by the sampling resistor or the HALL for low-voltage and large current are solved. The circuit of this embodiment simple structure, occupation space area are little and with low costs, possess market spreading value.

While the utility model has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the utility model. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the utility model without departing from the essential scope thereof. Therefore, it is intended that the utility model not be limited to the particular embodiment disclosed, but that the utility model will include all embodiments falling within the scope of the appended claims.

Claims

1. A current sampling circuit of a portable energy storage inversion module is characterized by comprising a current sampling module (1) and a current amplification module (2) connected with the current sampling module (1);

the current sampling module (1) is provided with a copper foil (10), and the current of the energy storage inversion module is sampled through the copper foil (10); the current amplification module (2) is used for amplifying the sampled current.

2. The current sampling circuit of the portable energy storage inverter module according to claim 1, wherein the current sampling module (1) further comprises a first resistor R1, a second resistor R2, a first capacitor C1, and a second capacitor C2;

two ends of the copper foil (10) are respectively connected with one end of the first resistor R1 and one end of the second resistor R2; the other end of the first resistor R1 and the other end of the second resistor R2 are respectively connected with the two pole plates of the first capacitor C1; one polar plate of the second capacitor C2 is connected with one end of the copper foil (10), and the other polar plate is grounded.

3. The current sampling circuit of the portable energy storage inverter module as claimed in claim 2, wherein an input terminal is provided at the connection of the copper foil (10) and the first resistor R1, and an input voltage Vin is connected;

and an output end is arranged at the joint of the copper foil (10) and the second capacitor C2, and the output voltage is Vout.

4. The current sampling circuit of the portable energy storage inversion module as claimed in claim 2, wherein the current amplification module (2) comprises a differential amplifier EA, a third resistor R3, a fourth resistor R4, a fifth resistor R5 and a third capacitor C3;

the input anode of the differential amplifier EA is connected with one end of the third resistor R3, the input cathode thereof is connected with one end of the fourth resistor R4, one end of the fifth resistor R5 and one polar plate of the third capacitor C3, and the output end thereof is connected with the other end of the fifth resistor R5 and the other polar plate of the third capacitor C3;

the other end of the third resistor R3 is connected with one end of the first resistor R1 and one polar plate of the first capacitor C1; the other end of the fourth resistor R4 is connected with one end of the second resistor R2 and the other polar plate of the first capacitor C1.

5. The current sampling circuit of the portable energy storage inverter module as claimed in claim 4, wherein the output terminal of the differential amplifier EA outputs a sampled amplified current Isense.

6. The current sampling circuit of the portable energy storage inverter module as claimed in claim 4, further comprising a sixth resistor R6, a fourth capacitor C4;

one end of the sixth resistor R6 and one plate of a fourth capacitor C4 are both connected between the input anode of the differential amplifier EA and the third resistor R3; the other end of the sixth resistor R6 and the other plate of the fourth capacitor C4 are both grounded.