CN221261092U

CN221261092U - Current detection module

Info

Publication number: CN221261092U
Application number: CN202322485192.7U
Authority: CN
Inventors: 耿名见; 陈瑞青; 朱鹏
Original assignee: Tianjin Senpujie Electronics Co ltd
Current assignee: Tianjin Senpujie Electronics Co ltd
Priority date: 2023-09-13
Filing date: 2023-09-13
Publication date: 2024-07-02
Anticipated expiration: 2033-09-13

Abstract

The utility model discloses a current detection module which comprises a current acquisition circuit, a main chip circuit, a CAN communication circuit, a display circuit and a voltage conversion circuit, wherein the current acquisition circuit, the CAN communication circuit, the display circuit and the voltage conversion circuit are all connected with the main chip circuit. The current detection module provided by the utility model has the advantages of small heating value and high accuracy, is favorable for secondary utilization, CAN send the current value to a CAN network, and CAN be displayed on an OLED display screen, and is visual and convenient.

Description

Current detection module

Technical Field

The utility model relates to the technical field of current detection, in particular to a current detection module.

Background

In the prior art, after the current is detected, the voltage values at two ends of the resistor are mainly measured, and then the magnitude of the current value is deduced according to a U=IR formula, however, in the actual use process, the larger the current is, the larger the heating value of the resistor is, and after the resistor works for a long time, the precision of the resistor is always lowered, so that the measurement of the current value is inaccurate, and the secondary development and utilization of the current are affected.

Disclosure of utility model

In view of the above-described drawbacks or shortcomings of the related art, it is desirable to provide a current detection module having high accuracy and a small amount of heat generation.

The utility model provides a current detection module, comprising:

The current acquisition circuit, the main chip circuit, the CAN communication circuit and the display circuit are connected with the main chip circuit.

Further, the CURRENT collection circuit includes a CURRENT chip hall CURRENT sensor CC6920, a pin IP of the CC6920 is connected with a positive input port and a negative input port, an output pin OUT of the CC6920 is sequentially connected in series with a first resistor, a second resistor and a first capacitor, a middle node of the first resistor and the second resistor are connected with a first end of a third resistor, a second end of the third resistor is grounded, a middle node of the second resistor and the first capacitor is connected with a main chip circuit through an interface CURRENT ADC1, one end of the first capacitor is grounded, an output pin VCC of the CC6920 is connected in series with a second capacitor, and one end of the second capacitor is grounded.

Further, the first resistor and the second resistor are respectively 0R and 100R, the third resistor is NC, and the first capacitor and the second capacitor are both 100nF.

Further, the main chip circuit comprises a main chip GD32a503, and a plurality of identification interfaces are arranged on the GD32a503 and are used for being connected with the current acquisition circuit, the CAN communication circuit and the display circuit in an identification mode.

Further, the CURRENT collecting circuit is provided with 5 paths, and is connected with the identification interface of the GD32a503 through interfaces CURRENT ADC1, CURRENT ADC2, CURRENT ADC3, CURRENT ADC4 and CURRENT ADC5 respectively.

Further, the CAN communication circuit comprises a CAN chip SIT144T/3, a pin TXD and a pin RXD of the SIT144T/3 are connected in series with a fourth resistor, one end of the fourth resistor is connected with an identification interface on the GD32A503 through an interface CANTX0, a fifth resistor is connected in series with a middle node of the fourth resistor through a pin RXD of the SIT144T/3, a pin STB of the SIT144T/3 is connected with an identification interface on the GD32A503 through an interface CAN0_STB, a third capacitor and a fourth capacitor are connected in parallel between a pin GND and a pin VCC of the SIT144T/3, one end of the fourth capacitor is grounded, and a pin VIO of the SIT144T/3 is connected with the fifth capacitor and the sixth capacitor in parallel.

Further, a common-mode inductor is connected between the output end CANH and the output end CANL of the SIT144T/3, a pin 1 of the common-mode inductor is connected with the output end CANH, a pin 2 of the common-mode inductor is connected with the output end CANL, a first electrostatic protection device and a second electrostatic protection device are sequentially connected in series between a pin 4 and a pin 3 of the common-mode inductor, an intermediate node between the pin 2 of the first electrostatic protection device and the pin 1 of the second electrostatic protection device is grounded, a sixth resistor is connected in parallel between the pin 1 and the pin 4 of the common-mode inductor and between the pin 2 and the pin 3 of the common-mode inductor, a seventh capacitor is connected in series between the intermediate node between the pin 4 of the common-mode inductor and the pin 2 of the second electrostatic protection device, one end of the seventh capacitor is grounded, a node a is arranged between the pin 4 of the common-mode inductor and the seventh capacitor, a node b is arranged between the pin 3 of the common-mode inductor and the seventh capacitor, and the eighth node b is connected in series between the seventh capacitor and the seventh node, and the seventh node b is connected in series.

Further, the fourth resistor is 1K, the fifth resistor is 100K, the sixth resistor is 0R, the seventh resistor is 2.7K, the third capacitor and the fifth capacitor are 100nF, the fourth capacitor and the sixth capacitor are 100pF, the seventh capacitor is 22pF, and the eighth capacitor is 47nF.

Further, the current detection module further includes a display circuit, which includes an OLED display screen, and the OLED display screen is electrically connected to the GD32a503 through iic_scl and iic_sda.

Further, the current detection module further comprises a voltage conversion circuit for converting the access voltage into an operating voltage inside each circuit.

Compared with the prior art, the utility model has the beneficial effects that:

(1) The current detection module is provided with 5 paths of current acquisition circuits, current is acquired by using a current chip in the current acquisition circuits, the heat productivity is small, the precision is high, and the current detection module can be combined with a peripheral circuit to convert the acquired current into voltage;

(2) The current detection module is provided with a main chip circuit and a communication circuit instead, the main chip is used for processing the acquired current value, the processed data is sent to the CAN chip, and the CAN chip is used for sending the CAN data to a CAN network;

(3) The current detection module is provided with the OLED display screen, and can directly display the current value on the screen, so that the current detection result is visual.

It should be understood that the description in this summary is not intended to limit the critical or essential features of the embodiments of the utility model, nor is it intended to limit the scope of the utility model. Other features of the present utility model will become apparent from the description that follows.

Drawings

Other features, objects and advantages of the present utility model will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the accompanying drawings in which:

FIG. 1 is a block diagram of a current detection module;

FIG. 2 is a schematic diagram of a current collection circuit;

FIG. 3 is a schematic diagram of a CAN communication circuit;

FIG. 4 is a schematic diagram of a main chip circuit;

Fig. 5 is a schematic diagram showing a circuit.

Reference numerals in the drawings: 1. a current acquisition circuit; 2. a main chip circuit; 3. a CAN communication circuit; 4. a display circuit; 5. and a voltage conversion circuit.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting of the utility model. It should be noted that, for convenience of description, only the portions related to the utility model are shown in the drawings.

It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other. The utility model will be described in detail below with reference to the drawings in connection with embodiments.

Referring to fig. 1 to 5, an embodiment of the present utility model provides a current detection module, which includes a current collection circuit 1, a main chip circuit 2, a CAN communication circuit 3, a display circuit 4 and a voltage conversion circuit 5. When the current acquisition module works, the voltage conversion circuit 5 converts an input voltage 12V in a circuit into a working voltage 5V required by a working circuit in the current acquisition circuit 1, then a pin VCC of a current chip Hall current sensor CC6920 is connected in series into the current acquisition circuit 1, acquired current data are transmitted to the main chip circuit 2 through the current acquisition circuit 1, the current value is processed through the main chip GD32A503 and is transmitted to the CAN communication circuit 3, the CAN data are transmitted to a CAN network after being processed through a CAN chip SIT144T/3, and meanwhile, the data such as the current value and the like CAN be displayed on an OLED display screen through the display circuit 4.

In a preferred embodiment, as shown in fig. 2, the CURRENT collecting circuit 1 includes a CURRENT chip hall CURRENT sensor CC6920, a pin IP of the CC6920 is connected to a positive input port and a negative input port, an output pin OUT of the CC6920 is sequentially connected in series with a first resistor, a second resistor and a first capacitor, a middle node of the first resistor and the second resistor is connected to a first end of a third resistor, a second end of the third resistor is grounded, a middle node of the second resistor and the first capacitor is connected to a main chip circuit through an interface CURRENT ADC1, one end of the first capacitor is grounded, an output pin VCC of the CC6920 is connected in series with a second capacitor, and one end of the second capacitor is grounded.

In the present embodiment, the current chip adopts a hall current sensor CC6920 series chip, alternatively, in other embodiments, the current chip is not limited to the CC6920 series, and any current chip satisfying the use requirement may be selected.

In a preferred embodiment, as shown in fig. 2, the first resistor and the second resistor are respectively 0R and 100R, the third resistor is NC, and the first capacitor and the second capacitor are both 100nF.

In a preferred embodiment, as shown in fig. 2 and 4, the main chip circuit 2 includes a main chip GD32a503, and a plurality of identification interfaces are provided on the GD32a503 for identification connection with the current acquisition circuit 1, the CAN communication circuit 3 and the display circuit 4.

IN this embodiment, the main chip adopts GD32a503VDT3, the identification interface thereon is also used for identification connection of the oscillating circuit, the downloading circuit, and the ADC circuit, the oscillating circuit is connected with pins 15, 16 of GD32a503 through interfaces OSC IN and OSC OUT, the downloading circuit is connected with pins 96, 98 of GD32a503 through interfaces BOOT1_ SWDIO and SWCLK, pins 1, 2, 3, and 4 of the ADC chip are connected with pins 66, 67, 68, and 69 of GD32a503 respectively,

Alternatively, in other embodiments, the host chip may be any chip that supports CAN communication and current collection.

In a preferred embodiment, as shown in fig. 4, the CURRENT acquisition circuit 1 is provided with 5 paths connected to the identification interface of GD32a503 via interfaces CURRENT ADC1, CURRENT ADC2, CURRENT ADC3, CURRENT ADC4, and CURRENT ADC5, respectively.

In this embodiment, GD32a503 identification interfaces matched to 5-way current collection circuit 1 correspond to upper pins 44, 45, 46, 47 and 48, respectively.

In a preferred embodiment, as shown in fig. 3 and 4, the CAN communication circuit includes a CAN chip SIT144T/3, a fourth resistor is connected in series to both a pin TXD and a pin RXD of SIT144T/3, one end of the fourth resistor is connected to an identification interface on GD32a503 through an interface CANTX0, a fifth resistor is connected in series to an intermediate node of the pin RXD of SIT144T/3 and the fourth resistor, a pin STB of SIT144T/3 is connected to an identification interface on GD32a503 through an interface CAN0_stb, a third capacitor and a fourth capacitor are connected in parallel between a pin GND and a pin VCC of SIT144T/3, one end of the fourth capacitor is grounded, and a pin VIO of SIT144T/3 is connected to the fifth capacitor and the sixth capacitor in parallel.

In this embodiment, SIT144T/3 is connected to pins 52, 53, 54 of GD32A503 through two interfaces CANTX0 and CAN 0_STB.

In a preferred embodiment, as shown in fig. 3, a common-mode inductor is connected between an output end CANH and an output end CANL of the SIT144T/3, a pin 1 of the common-mode inductor is connected with the output end CANH, a pin 2 of the common-mode inductor is connected with the output end CANL, a first electrostatic protection device and a second electrostatic protection device are sequentially connected in series between a pin 4 and a pin 3 of the common-mode inductor, an intermediate node between the pin 2 of the first electrostatic protection device and the pin 1 of the second electrostatic protection device is grounded, a sixth resistor is connected in parallel between the pin 1 and the pin 4 of the common-mode inductor and between the pin 2 and the pin 3 of the common-mode inductor, an intermediate node between the pin 4 of the common-mode inductor and the pin 2 of the second electrostatic protection device is connected with a seventh capacitor in series, a node a is arranged between the pin 4 of the common-mode inductor and the seventh capacitor, a node b is arranged between the pin 3 of the common-mode inductor and the seventh capacitor, two resistors are connected in series between the node a and the node b, and an eighth capacitor is connected in series between the seventh resistor and the eighth capacitor is connected in series.

In this embodiment, the received current information is processed by SIT144T/3 and CAN data is sent to the CAN network.

In a preferred embodiment, as shown in fig. 2, the fourth resistor is 1K, the fifth resistor is 100K, the sixth resistor is 0R, the seventh resistor is 2.7K, the third capacitor and the fifth capacitor are 100nF, the fourth and sixth capacitors are 100pF, the seventh capacitor is 22pF, and the eighth capacitor is 47nF.

In a preferred embodiment, as shown in fig. 2, the display circuit 4 comprises an OLED display screen electrically connected to GD32a503 through iic_scl and iic_sda.

In this embodiment, the OLED display is set to 0.96 inches, and the 0.96OLED display SIT144T/3 is connected to pins 78, 79 of GD32A503 through IIC_SCL and IIC_SDA.

In a preferred embodiment, as shown in fig. 2, the current detection module further includes a voltage conversion circuit 5 for converting the access voltage into an operating voltage inside each circuit.

In this embodiment, the voltage conversion circuit 5 may include two routes for converting the switching-in voltage from 12V to 5V and from 5V to 3.3V, for providing a suitable power supply to the whole current detection template.

In the description of the present specification, the terms "connected," "mounted," "secured," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present specification, the terms "one embodiment," "some embodiments," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above is only a preferred embodiment of the present application, and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A current detection module, comprising:

The current acquisition circuit (1), the main chip circuit (2), the CAN communication circuit (3) and the display circuit (4) are connected with the main chip circuit (2); the CURRENT acquisition circuit (1) comprises a CURRENT chip Hall CURRENT sensor CC6920, a pin IP of the CC6920 is connected with a positive input port and a negative input port, a first resistor, a second resistor and a first capacitor are sequentially connected in series with an output pin OUT of the CC6920, a middle node of the first resistor and the second resistor is connected with a first end of a third resistor, a second end of the third resistor is grounded, a middle node of the second resistor and the first capacitor is connected with a main chip circuit (2) through an interface CURRENT ADC1, one end of the first capacitor is grounded, a second capacitor is connected in series with an output pin VCC of the CC6920, and one end of the second capacitor is grounded; the main chip circuit (2) comprises a main chip GD32A503, wherein a plurality of identification interfaces are arranged on the GD32A503 and are used for being connected with the current acquisition circuit (1), the CAN communication circuit (3) and the display circuit (4) in an identification way; the CURRENT acquisition circuit (1) is provided with 5 paths, and is connected with the identification interface of the GD32A503 through interfaces CURRENT ADC1, CURRENT ADC2, CURRENT ADC3, CURRENT ADC4 and CURRENT ADC5 respectively.

2. The current detection module of claim 1, wherein the first and second resistors are 0R and 100R, respectively, the third resistor is NC, and the first and second capacitors are 100nF.

3. The current detection module according to claim 2, wherein the CAN communication circuit (3) includes a CAN chip SIT144T/3, a pin TXD and a pin RXD of the SIT144T/3 are both connected in series with a fourth resistor, one end of the fourth resistor is connected to the identification interface on the GD32a503 through an interface CANTX0, a pin RXD of the SIT144T/3 is connected in series with a fifth resistor with an intermediate node of the fourth resistor, a pin STB of the SIT144T/3 is connected to the identification interface on the GD32a503 through an interface can0_stb, a third capacitor and a fourth capacitor are connected in parallel between a pin GND and a pin VCC of the SIT144T/3, one end of the fourth capacitor is grounded, and a pin VIO of the SIT144T/3 is connected to the fifth capacitor and the sixth capacitor in parallel.

4. The current detection module according to claim 3, wherein a common-mode inductor is connected between an output terminal CANH and an output terminal CANL of the SIT144T/3, a pin 1 of the common-mode inductor is connected with the output terminal CANH, a pin 2 of the common-mode inductor is connected with the output terminal CANL, a first electrostatic protection device and a second electrostatic protection device are sequentially connected in series between a pin 4 and a pin 3 of the common-mode inductor, an intermediate node between the pin 2 of the first electrostatic protection device and the pin 1 of the second electrostatic protection device is grounded, a sixth resistor is connected in parallel between the pin 1 and the pin 4 of the common-mode inductor and between the pin 2 and the pin 3 of the common-mode inductor, a seventh capacitor is connected in series between the pin 3 of the common-mode inductor and the pin 2 of the second electrostatic protection device, one end of the seventh capacitor is grounded, an intermediate node between the pin 4 of the common-mode inductor and the seventh capacitor is connected in series between the seventh capacitor and the seventh node, an intermediate node between the common-mode inductor and the seventh capacitor is connected in series between the seventh node and the seventh node is connected in parallel, and the seventh resistor is connected in series between the seventh node and the seventh node is connected in parallel.

5. The current detection module of claim 4, wherein the fourth resistance is 1K, the fifth resistance is 100K, the sixth resistance is 0R, the seventh resistance is 2.7K, the third and fifth capacitances are 100nF, the fourth and sixth capacitances are 100pF, the seventh capacitance is 22pF, and the eighth capacitance is 47nF.

6. The current detection module according to claim 5, characterized in that the display circuit (4) comprises an OLED display screen electrically connected to the GD32a503 through iic_scl and iic_sda.

7. The current detection module according to claim 6, further comprising a voltage conversion circuit (5) for converting the access voltage into an operating voltage inside each circuit.