Current detection device

Abstract

The current detection device comprises a current sensor unit, a signal processing unit, a main control unit and a communication unit which are connected in sequence, the current sensor unit is used for measuring a current signal in a load and comprises an electromagnetic induction structure formed by at least two layers of electromagnetic coils connected in series, each layer of electromagnetic coil is provided with a secondary current tap, and primary large current is converted into secondary small current by multiple times; the secondary output end of each layer of electromagnetic coil is connected in series with a filtering magnetic bead and a high-frequency filtering capacitor; the signal processing unit is used for amplifying the secondary current output by each layer of electromagnetic coil and converting the secondary current into a corresponding voltage signal; the main control unit comprises a controller and an AD conversion module, the AD conversion module converts an input analog signal into a digital signal, and the controller calculates a secondary current value output by each layer of electromagnetic coil according to the digital signal and calculates a load current according to the primary and secondary turn ratio of the electromagnetic coil.

Description

TECHNICAL FIELD

[0001] The utility model belongs to current detection technical field relates to a current detection device. BACKGROUND

[0002] As one of the key technologies of power system, electronic equipment and various intelligent applications, the precision and response speed of current detection directly affect the stability and safety of equipment operation. At the same time, the stability and timeliness of current signal source are crucial. With the continuous improvement of electronic technology and intelligent demand, the traditional current detection method gradually exposes the problems of low precision, limited small current detection ability and insufficient anti-interference ability due to single current signal. SUMMARY

[0003] To solve the above technical problems, the utility model aims at providing a current detection device.

[0004] The utility model provides a current detection device, which comprises a current sensor unit, a signal processing unit, a main control unit and a communication unit connected in sequence.

[0005] The current sensor unit measures the current signal in the load and comprises an electromagnetic induction structure composed of at least two layers of series-connected electromagnetic coils. Each layer of electromagnetic coil is provided with a secondary current tap, which converts the primary large current into secondary small current multiple times. The secondary output end of each layer of electromagnetic coil is connected in series with a filter magnetic bead and a high-frequency filter capacitor.

[0006] The signal processing unit amplifies and converts the secondary current output by each layer of electromagnetic coil into a corresponding voltage signal.

[0007] The main control unit comprises a controller and an AD conversion module. The AD conversion module converts the input analog signal into a digital signal. The controller calculates the secondary current value output by each layer of electromagnetic coil according to the digital signal and calculates the load current according to the primary and secondary turns ratio of each layer of electromagnetic coil.

[0008] Further, the current sensor unit further comprises an electromagnetic shielding cover plate, which is arranged outside the electromagnetic induction structure.

[0009] Further, the communication unit comprises an Ethernet interface, a wireless local area network interface, a Bluetooth module, a PROFIBUS-DP interface and an RS-485 interface.

[0010] Further, the main control unit further comprises a storage module, the storage module stores the primary and secondary turns ratio of each layer of electromagnetic coil, the controller calculates the primary and secondary current ratio of each layer of electromagnetic coil according to the secondary current value of each layer of electromagnetic coil; the primary and secondary turns ratio of each layer of electromagnetic coil is compared with the pre-stored primary and secondary turns ratio of electromagnetic coil, and then it is judged whether the current sensor unit is aged.

[0011] The current detection device of the utility model, through setting electromagnetic induction structure of multilayer electromagnetic coil series connection, can more accurately capture load current signal, accurately transform primary large current into stable secondary small current, which makes electric quantity detection more sensitive and fast. Meanwhile, each layer of electromagnetic coil adopts electromagnetic filter device to filter out spurious interference in electromagnetic coil, and metal cover plate is arranged outside multilayer electromagnetic coil to shield interference source. Effectively reduce the influence of external electromagnetic interference on detection result. The current detection device of the utility model can realize accurate current detection, and then help real-time monitoring of power grid load condition, prevent potential overload risk. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is the structure diagram of the current detection device of the utility model;

[0013] Figure 2 It is the schematic diagram of the electromagnetic induction structure of the utility model. CONCRETE IMPLEMENTATION

[0014] As Figure 1 The utility model discloses a current detection device, which comprises a current sensor unit, a signal processing unit, a main control unit and a communication unit connected in sequence.

[0015] The current sensor unit is used for measuring the current signal in the load and comprises an electromagnetic induction structure composed of at least two layers of electromagnetic coils connected in series. Each layer of electromagnetic coil is provided with a secondary current tap, and the primary large current is transformed into secondary small current for multiple times. The secondary output end of each layer of electromagnetic coil is connected with a filter magnetic bead and a high-frequency filter capacitor in series. The filter magnetic bead and the high-frequency filter capacitor arranged at the output end of each layer of electromagnetic coil constitute an electromagnetic filter module. The current sensor unit further comprises an electromagnetic shielding cover plate, which is arranged outside the electromagnetic induction structure to shield the interference source.

[0016] As Figure 2The electromagnetic induction structure is composed of three layers of electromagnetic coils in series. L1-L3 are filter magnetic beads, C1-C3 are high-frequency filter capacitors, and R1-R3 are secondary output resistors. The electromagnetic induction structure is composed of three layers of electromagnetic coils in series. The design of each layer of electromagnetic coils fully considers the efficiency and accuracy of signal capture, making the current data obtained from the current sensor unit more accurate and reliable. The multi-layer design can achieve high-precision current detection in different current ranges, and can increase the load overload capacity while ensuring measurement accuracy. It effectively reduces the influence of external electromagnetic interference on detection accuracy.

[0017] The signal processing unit is used to amplify the secondary current output by each layer of electromagnetic coils and convert it into a corresponding voltage signal, which is then output to the main control unit.

[0018] The main control unit includes a controller and an AD conversion module. The AD conversion module converts the input analog signal into a digital signal. The controller calculates the secondary current value output by each layer of electromagnetic coils based on the digital signal, and calculates the load current based on the primary and secondary turn ratio of each layer of electromagnetic coils. The main control unit also includes a storage module that stores the primary and secondary turn ratio values of each layer of electromagnetic coils. The controller calculates the primary and secondary current ratio of each layer of electromagnetic coils based on the secondary current value of each layer of electromagnetic coils. The controller compares the primary and secondary current ratio of each layer of electromagnetic coils with the pre-stored primary and secondary turn ratio values of the electromagnetic coils to determine whether the current sensor unit is aging.

[0019] The communication unit includes an Ethernet interface, a wireless local area network interface, a Bluetooth module, a PROFIBUS-DP interface, and an RS-485 interface. These interfaces can be selected and configured according to specific application requirements. Through these communication interfaces, the current detection device can realize real-time transmission and remote monitoring of data with the host computer, intelligent control system or cloud server, thereby realizing real-time tracking and management of the current state. For example, through connection with the cloud platform, centralized management and analysis of large-scale current data can be realized, providing more accurate energy consumption analysis and optimization suggestions for users; through integration with the smart home system, remote monitoring and intelligent control of electrical equipment can be realized, improving home safety and comfort.

[0020] Traditional current sensors are often affected by external electromagnetic interference, resulting in low detection accuracy or slow response speed, especially when small currents need to be accurately detected. The current detection device of the present application has significant technical advantages in current detection accuracy, stability and intelligent management, and is suitable for various power systems, electronic devices and intelligent control fields.

[0021] The above merely describes preferred embodiments of the present application and is not intended to limit the spirit of the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A current detection device, characterized by, The application relates to a current sensor unit, a signal processing unit, a main control unit and a communication unit connected in sequence. The current sensor unit measures a current signal in a load and comprises an electromagnetic induction structure composed of at least two layers of electromagnetic coils connected in series, each layer of electromagnetic coil is provided with a secondary current tap, and a primary large current is transformed into a secondary small current in multiple times; the secondary output end of each layer of electromagnetic coil is connected with a filtering magnetic bead and a high-frequency filtering capacitor in series. The signal processing unit amplifies the secondary current output by each layer of electromagnetic coil and converts the secondary current into a corresponding voltage signal. The main control unit comprises a controller and an AD conversion module, the AD conversion module converts an input analog signal into a digital signal, the controller calculates the secondary current value output by each layer of electromagnetic coil according to the digital signal, and calculates the load current according to the primary and secondary turn ratio of each layer of electromagnetic coil. The current sensor unit further comprises an electromagnetic shielding cover plate which is arranged outside the electromagnetic induction structure.

2. The current detection device according to claim 1, wherein The communication unit comprises an Ethernet interface, a wireless local area network interface, a Bluetooth module, a PROFIBUS-DP interface and an RS-485 interface.

3. The current detection device according to claim 1, wherein The main control unit further comprises a storage module, the storage module stores the primary and secondary turn ratio values of each layer of electromagnetic coil, the controller calculates the primary and secondary current ratio of each layer of electromagnetic coil according to the secondary current value of each layer of electromagnetic coil; the primary and secondary current ratio of each layer of electromagnetic coil is compared with the pre-stored primary and secondary turn ratio values of the electromagnetic coil, so as to judge whether the current sensor unit is aged or not.

4. The current sensing device of claim 1, wherein, ​

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