An open core current transformer and power supply system

Abstract

The utility model discloses an open current transformer and power supply system relates to current transformer technical field. The open current transformer includes the open magnetic ring and the sampling winding and the power supply winding of setting in the open magnetic ring, and the sampling winding is used to gather current signal and will be transmitted to the AD sampling mouth of sensor or MCU, and the number of turns of power supply winding is determined according to the power supply voltage and power demand of power supply system. The power supply system is based on above -mentioned open current transformer construction, can provide drive signal for auxiliary switch, and power supply for MCU, wireless anti -reverse flow control switch, wiFi module, 4G module and bluetooth chip etc.

Description

Technical Field

[0001] This utility model relates to the field of current transformer technology, specifically to an open current transformer and its power supply system. Background Technology

[0002] In fields such as power monitoring and industrial control, current transformers are commonly used current acquisition elements. Their main function is to convert high-voltage, high-current power signals into low-voltage, low-current signals for subsequent measurement, protection, and control. Meanwhile, these systems often require power to devices such as MCUs, communication modules, and control switches. Traditional power supply methods typically involve directly drawing power from the power grid and using power supply circuits composed of transformers, rectifiers, and voltage regulators.

[0003] However, the traditional method of separating current sampling from power supply has many drawbacks. On the one hand, it requires a separate power supply line to draw power from the grid, increasing the complexity of the system wiring, which not only raises installation costs and difficulty but may also lead to system failures or even safety hazards due to wiring errors. On the other hand, for some scenarios requiring flexible deployment or temporary monitoring, the additional power supply wiring limits the scope and flexibility of the equipment. In addition, in specific applications such as wireless backflow prevention, the system usually needs to simultaneously perform functions such as current sampling, wireless communication, and switch control, and traditional power supply methods are difficult to meet the requirements of system miniaturization and integration.

[0004] Open-type current transformers have gained widespread attention in practical applications due to their ease of installation, as they can be installed without disconnecting the main circuit. However, most existing open-type current transformers only have current sampling capabilities and cannot simultaneously provide power to the system, still requiring reliance on external power grids, thus failing to solve the problems associated with the traditional method.

[0005] Therefore, developing an open-type current transformer and its corresponding power supply system that can both perform current sampling and provide auxiliary power to the control system has become a pressing technical problem in this field. Utility Model Content

[0006] The purpose of this utility model is to overcome the shortcomings of the prior art and provide an open-ended current transformer and power supply system. The open-ended current transformer integrates a sampling winding and a power supply winding, which can supply power to the system while collecting current signals, realize the independent operation of the control system, eliminate the need to draw power from the power grid, and simplify the system power supply requirements and wiring complexity.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: an open-ended current transformer, comprising an open-ended magnetic ring, a sampling winding, and a power supply winding; both the sampling winding and the power supply winding are disposed within the open-ended magnetic ring; the sampling winding is used to collect current signals and transmit the collected current signals to the AD sampling port of a sensor or MCU; the number of turns of the power supply winding is set according to the power supply voltage and power requirements of the supporting power supply system.

[0008] The open magnetic ring is made of a soft magnetic material with high magnetic permeability, such as permalloy or ferrite, to improve magnetic coupling efficiency and enhance the strength and stability of the induced current.

[0009] The open magnetic ring is equipped with a snap-fit ​​structure to realize the opening, closing and fixing of the open magnetic ring, which facilitates installation and disassembly without cutting the main circuit wires, thus improving the ease of use.

[0010] The open magnetic ring is equipped with a snap-fit ​​structure to realize the opening, closing and fixing of the open magnetic ring, which facilitates installation and disassembly without cutting the main circuit wires, thus improving the ease of use.

[0011] This utility model also provides a power supply system based on the above-mentioned open current transformer, including the above-mentioned open current transformer, and further including a power management module and a load module; the power supply winding of the open current transformer is connected to the power management module for outputting induced current to the power management module; the power management module is connected to the load module for converting the induced current into a stable power supply voltage to supply power to the load module.

[0012] The load module includes an MCU, a wireless anti-backflow control switch, and a communication module; the communication module includes at least one of a WiFi module, a 4G module, and a Bluetooth chip, which can meet the data transmission needs in different scenarios.

[0013] The power management module includes a rectifier circuit, a filter circuit, and a voltage regulator circuit. The rectifier circuit is connected to the power supply winding and is used to convert the AC power output from the power supply winding into DC power. The filter circuit is connected to the rectifier circuit and is used to filter the DC power to remove harmonics and interference signals. The voltage regulator circuit is connected to the filter circuit and is used to stabilize the filtered DC power to a preset voltage value, such as 3.3V or 5V, to adapt to the power supply requirements of different load devices.

[0014] The power supply system also includes an auxiliary switch drive module; the auxiliary switch drive module is connected to the power management module and the auxiliary switch respectively, and is used to drive the auxiliary switch to operate under the power supply of the power management module, so as to control the external device.

[0015] The sampling winding of the open current transformer is connected to the AD sampling port of the MCU to transmit the collected current signal to the MCU. The MCU can analyze and process the current signal, and control the auxiliary switch action through the auxiliary switch drive module according to the processing result, or upload the data to a remote terminal through the communication module.

[0016] The beneficial effects of this utility model are: high integration: the open current transformer of this utility model is equipped with both sampling winding and power supply winding. While realizing the current sampling function, it can provide power to the entire control system without the need to set up an independent power supply and power supply line, which greatly simplifies the structural design of the system.

[0017] Easy installation: The snap-fit ​​structure on the open magnetic ring allows the current transformer to be quickly installed and removed without disconnecting the main circuit, reducing installation difficulty and cost, and improving construction efficiency.

[0018] High independence: This power supply system is based on the induced current of an open current transformer to provide power, without the need to draw power from the grid. This allows the control system to operate independently and is suitable for scenarios where there is no external power supply or where power supply is inconvenient, thus expanding the application range of the system.

[0019] Wide adaptability: The number of turns of the power supply winding can be flexibly set according to the power supply voltage and power requirements. The power management module can output stable voltage values ​​and can be adapted to various load devices such as MCU, various communication modules, and control switches to meet different application needs.

[0020] High reliability: Through the rectification, filtering and voltage regulation of the power management module, a stable and reliable power supply can be provided to the load, reducing the impact of grid fluctuations on the system; at the same time, the simplified wiring method reduces the risk of failure due to wiring errors. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the open-type current transformer structure of this utility model; Figure 2 This is an overall structural block diagram of an open-type current transformer and power supply system according to the present invention. Figure 3 This is a schematic diagram of the internal structure of the power management module of an open current transformer and power supply system according to the present invention. Figure 4 This is a schematic circuit diagram of the first embodiment of the present invention; Figure 5 This is a schematic circuit diagram of the second embodiment of the present invention. Detailed Implementation

[0022] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0023] An open-ended current transformer includes an open magnetic ring, a sampling winding, and a power supply winding. The open magnetic ring is made of ferrite material, possessing high permeability and stability. A plastic snap-fit ​​structure is provided at the opening for easy opening, closing, and fixing. The sampling winding is made of 200 turns of 0.1mm diameter enameled wire and is used to collect the current signal from the main circuit and transmit it to the AD sampling port of the MCU. The power supply winding, based on the requirement of the power supply system to output 5V voltage and 2W power, is made of 500 turns of 0.3mm diameter enameled wire.

[0024] A power supply system includes the open-circuit current transformer described in Embodiment 1, and further includes a power management module, an MCU, a wireless anti-reverse current control switch, a WiFi module, and an auxiliary switch driver module. The power management module consists of a bridge rectifier circuit, a capacitor filter circuit, and an LDO voltage regulator circuit. The bridge rectifier circuit converts the AC power output from the power supply winding into DC power. The capacitor filter circuit removes noise from the DC power. The LDO voltage regulator stabilizes the voltage at 3.3V and 5V. The 3.3V voltage powers the MCU and the WiFi module, and the 5V voltage powers the auxiliary switch driver module. The sampling winding of the open-circuit current transformer is connected to the AD sampling port of the MCU. The output terminal of the MCU is connected to the auxiliary switch driver module, which is connected to the wireless anti-reverse current control switch. The MCU is also connected to the WiFi module via a UART interface.

[0025] In actual operation, when current flows through the main circuit, the open magnetic ring generates an alternating magnetic field. The sampling winding induces a current signal proportional to the main circuit current, which is then transmitted to the MCU's AD sampling port. The power supply winding induces AC current, which is processed by the power management module and converted into stable 3.3V and 5V DC voltages, supplying power to the MCU, WiFi module, and auxiliary switch driver module, respectively. The MCU analyzes the collected current signals. If reverse current is detected, the auxiliary switch driver module controls the wireless anti-reverse current control switch to open. Simultaneously, the WiFi module uploads the reverse current information and current data to the remote monitoring platform, enabling real-time monitoring and control of the power system.

[0026] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. An open-type current transformer, characterized in that, It includes an open magnetic ring, a sampling winding, and a power supply winding; both the sampling winding and the power supply winding are disposed within the open magnetic ring. The sampling winding is used to collect current signals and transmit the collected current signals to the AD sampling port of the sensor or MCU; the number of turns of the power supply winding is set according to the power supply voltage and power requirements of the supporting power supply system.

2. An open-type current transformer according to claim 1, characterized in that, The open magnetic ring is made of a soft magnetic material with high permeability.

3. An open-type current transformer according to claim 1, characterized in that, The open magnetic ring is provided with a snap-fit ​​structure for opening, closing and fixing the open magnetic ring.

4. A power supply system, characterized in that, The device includes the open-ended current transformer as described in any one of claims 1-3, and further includes a power management module and a load module; the power supply winding of the open-ended current transformer is connected to the power management module for outputting induced current to the power management module; the power management module is connected to the load module for converting the induced current into a stable power supply voltage to supply power to the load module.

5. A power supply system according to claim 4, characterized in that, The load module includes an MCU, a wireless anti-reverse current control switch, and a communication module; the communication module includes at least one of a WiFi module, a 4G module, and a Bluetooth chip.

6. A power supply system according to claim 4, characterized in that, The power management module includes a rectifier circuit, a filter circuit, and a voltage regulator circuit. The rectifier circuit is connected to the power supply winding and is used to convert the AC power output from the power supply winding into DC power. The filter circuit is connected to the rectifier circuit and is used to filter the DC power. The voltage regulator circuit is connected to the filter circuit and is used to stabilize the filtered DC power to a preset voltage value.

7. A power supply system according to claim 4, characterized in that, It also includes an auxiliary switch driving module; the auxiliary switch driving module is connected to the power management module and the auxiliary switch respectively, and is used to drive the auxiliary switch to operate under the power supply of the power management module.

8. A power supply system according to claim 4, characterized in that, The sampling winding of the open current transformer is connected to the AD sampling port of the MCU to transmit the acquired current signal to the MCU.

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