A CT power supply device and method with constant voltage and current limiting charging function

Abstract

The present invention relates to a CT power supply device with constant voltage and current limiting charging function, comprising a shell and a CT power supply module, a rectifier module, an overcurrent protection circuit, an output control circuit, a constant voltage and current limiting charging module, a load and a power supply module arranged in the shell; the shell is provided with a CT power supply coil; the CT power supply coil, the CT power supply module, the rectifier module, the output control circuit and the load are connected in sequence; the rectifier circuit is also connected to the overcurrent protection circuit; the output control circuit is connected to the power supply module through the constant voltage and current limiting charging module; the power supply module is connected to the load. The present invention can be flexibly applied to various occasions of power transmission lines, including overhead power transmission lines, tunnel cables, etc., to provide energy and backup battery charging lights for various monitoring devices.

Description

Technical Field

[0001] The present invention relates to the field of intelligent electricity consumption, and in particular to a CT power supply device and method with a constant voltage and current limiting charging function. Background Art

[0002] The power supply problem has always been a difficult problem to solve in the online monitoring device of the power transmission and transformation line, especially in the outdoor occasions where there is no conventional mains electricity. In order to improve the reliability and safety of the power transmission and transformation equipment, it is necessary to design a reliable CT power supply circuit. At present, the power supply used by the power transmission and transformation equipment mainly includes solar power supply and conventional CT power supply circuit. Solar power supply is easily affected by the weather, especially in spring and winter. In addition, it cannot work at night, which greatly reduces the effective working time of solar energy. In actual projects, it is often necessary to configure a capacity of 100 times the average power consumption of the device to meet the on-site needs. However, the existing CT power supply circuits on the market currently have only simple voltage output functions, which cannot meet the needs of devices with backup batteries in functional projects. Summary of the invention

[0003] In view of this, the purpose of the present invention is to provide a CT power supply device and method with constant voltage and current limiting charging function, which can be flexibly applied to various occasions of power transmission lines, including overhead power transmission lines, tunnel cables, etc., to provide energy and backup battery charging lights for various monitoring devices.

[0004] To achieve the above object, the present invention adopts the following technical solution:

[0005] A CT power taking device with a constant voltage and current limiting charging function comprises a shell and a CT power taking module, a rectifier module, an overcurrent protection circuit, an output control circuit, a constant voltage and current limiting charging module, a load and a power supply module arranged in the shell; the shell is provided with a CT power taking coil outside; the CT power taking coil, the CT power taking module, the rectifier module, the output control circuit and the load are connected in sequence; the rectifier circuit is also connected to the overcurrent protection circuit; the output control circuit is connected to the power supply module through the constant voltage and current limiting charging module; the power supply module is connected to the load.

[0006] Furthermore, the shell adopts a shell structure that can be installed on a power transmission line conductor.

[0007] Furthermore, the CT power taking coil adopts an open type CT power taking coil.

[0008] Furthermore, the CT power supply module specifically includes an adjustable resistor, a first capacitor, a first resistor, a third resistor, a fifth resistor, a seventh resistor, an eighth resistor, a first thyristor TR1, a second thyristor TR2 and a TVS tube; one end of the adjustable resistor is respectively connected to one end of the first capacitor, one end of the first resistor, the second anode of the second thyristor TR2 and the anode of the TVS tube; the other end of the adjustable resistor is respectively connected to one end of the third resistor, the first anode of the second thyristor TR2, one end of the seventh resistor and one end of the eighth resistor; the other end of the first capacitor is connected to the other end of the third resistor; the control electrode of the second thyristor TR2 is respectively connected to the second anode of the first thyristor TR1 and the other end of the seventh resistor; the other end of the first resistor is connected to the first anode of the first thyristor TR1; the control electrode of the first thyristor TR1 is connected to one end of the fifth resistor and the other end of the eighth resistor; the cathode of the TVS tube is connected to the other end of the fifth resistor.

[0009] Furthermore, the first thyristor TR1 adopts MAC97A6; the second thyristor TR2 adopts BTA16-600B.

[0010] A method for collecting electricity of a CT power collection device with a constant voltage and current limiting charging function, comprising the following steps:

[0011] Step S1: Install the device on the wire with power on to obtain energy from the wire;

[0012] Step S2: The CT power taking module converts the primary current on the wire into a secondary current;

[0013] Step S3: The rectifier circuit adjusts the secondary current and supplies power to the load through output control, while the excess energy is charged to the battery through the constant voltage and current limiting charging module.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The present invention can not only provide real-time energy for the online monitoring device, but also store the excess energy through a constant voltage and current limiting charging management circuit.

[0016] 2. The present invention can be flexibly applied to various occasions of power transmission lines, including overhead power transmission lines, tunnel cables, etc., to provide energy and backup battery charging lights for various monitoring devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a system structure block diagram in one embodiment of the present invention;

[0018] Figure 2 This is a circuit schematic diagram of a CT power supply module in one embodiment of the present invention;

[0019] Figure 3 It is a circuit schematic diagram of a constant voltage and current limiting charging module in one embodiment of the present invention. DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0021] Please refer to Figure 1 The present invention provides a CT power taking device with a constant voltage and current limiting charging function, comprising a shell and a CT power taking module, a rectifier module, an overcurrent protection circuit, an output control circuit, a constant voltage and current limiting charging module, a load and a power supply module arranged in the shell; the shell is provided with a CT power taking coil outside; the CT power taking coil, the CT power taking module, the rectifier module, the output control circuit and the load are connected in sequence; the rectifier circuit is also connected to the overcurrent protection circuit; the output control circuit is connected to the power supply module through the constant voltage and current limiting charging module; the power supply module is connected to the load.

[0022] In this embodiment, the housing adopts a housing structure that can be installed on a power transmission line conductor. The housing structure can conveniently insert the CT power card into the power transmission line conductor, which is simple and convenient to install, can shorten the construction period, improve efficiency, and enable the device to be put into operation quickly.

[0023] In this embodiment, the CT power taking coil adopts an open type CT power taking coil, which is responsible for collecting energy on the wire, passing through the electric field and magnetic field, and finally converting electricity to flow into the post-stage rectifier module.

[0024] refer to Figure 2The CT power supply overcurrent protection circuit uses a TVS tube as a trigger circuit. When the voltage in the system is higher than the conduction voltage of the TVS tube, the TVS tube triggers the thyristor TR1, TR1 conducts, triggers the thyristor TR2, and directly feeds back the energy in the line to the CT circuit, accelerating the saturation of the CT circuit and reducing the CT output current. The conventional CT power supply protection circuit uses a voltage regulator tube to stabilize the voltage, and the energy is not fed back to the CT, and it is achieved by simple voltage stabilization. The specific circuit includes an adjustable resistor RV1, a first capacitor C1, a first resistor R1, a third resistor R3, a fifth resistor R5, a seventh resistor R7, an eighth resistor R8, a first thyristor TR1, a second thyristor TR2 and a TVS tube; one end of the adjustable resistor is respectively connected to one end of the first capacitor, one end of the first resistor, the second anode of the second thyristor TR2 and the anode of the TVS tube; the other end of the adjustable resistor is respectively connected to one end of the third resistor, the first anode of the second thyristor TR2, one end of the seventh resistor and one end of the eighth resistor; the other end of the first capacitor is connected to the other end of the third resistor; the control electrode of the second thyristor TR2 is respectively connected to the second anode of the first thyristor TR1 and the other end of the seventh resistor; the other end of the first resistor is connected to the first anode of the first thyristor TR1; the control electrode of the first thyristor TR1 is connected to one end of the fifth resistor and the other end of the eighth resistor; the cathode of the TVS tube is connected to the other end of the fifth resistor.

[0025] In this embodiment, the rectifier module is responsible for rectifying the current flowing into the front end through the circuit and converting it into a 12V voltage output through the DCDC circuit. The rectifier module has a certain protection circuit. When the input current of the front end increases or the front end line is short-circuited, the current in the coil increases sharply. The protection circuit can release the excess energy to the CT coil through the current protection loop, so that the coil is quickly saturated to protect the subsequent circuit from impact.

[0026] refer to Figure 3 In this embodiment, CJ431 in the constant voltage and current limiting module charges the battery by controlling Q3, while R2 limits the output current. AP4313 achieves constant voltage output through feedback resistors R11, R38, and R13; the charging module with constant voltage and current limiting is responsible for charging the subsequent battery with the energy output by the rectifier module in a constant voltage and current limiting manner, and can charge batteries of different voltage levels and types by adjusting the constant voltage and current limiting.

[0027] In this embodiment, a power supply method of a CT power supply device with a constant voltage and current limiting charging function includes the following steps:

[0028] Step S1: Install the device on the wire with power on to obtain energy from the wire;

[0029] Step S2: The CT power taking module converts the primary current on the wire into a secondary current;

[0030] Step S3: The rectifier circuit adjusts the secondary current and supplies power to the load through output control, while the excess energy is charged to the battery through the constant voltage and current limiting charging module.

[0031] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made according to the scope of the patent application of the present invention should fall within the scope of the present invention.

Claims

1. A CT power supply device with constant voltage and current limiting charging function, characterized in that: It includes a shell and a CT power supply module, a rectifier module, an overcurrent protection circuit, an output control circuit, a constant voltage current limiting charging module, a load and a power supply module arranged in the shell; the shell is provided with a CT power supply coil; the CT power supply coil, the CT power supply module, the rectifier module, the output control circuit and the load are connected in sequence; the rectifier module is also connected to the overcurrent protection circuit; the output control circuit is connected to the power supply module through the constant voltage current limiting charging module; the power supply module is connected to the load; The CT power supply module specifically includes an adjustable resistor, a first capacitor, a first resistor, a third resistor, a fifth resistor, a seventh resistor, an eighth resistor, a first thyristor TR1, a second thyristor TR2 and a TVS tube; one end of the adjustable resistor is respectively connected to one end of the first capacitor, one end of the first resistor, the second anode of the second thyristor TR2 and the anode of the TVS tube; the other end of the adjustable resistor is respectively connected to one end of the third resistor, the first anode of the second thyristor TR2, one end of the seventh resistor and one end of the eighth resistor; the other end of the first capacitor is connected to the other end of the third resistor; the control electrode of the second thyristor TR2 is respectively connected to the second anode of the first thyristor TR1 and the other end of the seventh resistor; the other end of the first resistor is connected to the first anode of the first thyristor TR1; the control electrode of the first thyristor TR1 is connected to one end of the fifth resistor and the other end of the eighth resistor; the cathode of the TVS tube is connected to the other end of the fifth resistor.

2. A CT power supply device with constant voltage and current limiting charging function according to claim 1, characterized in that: The shell adopts a shell structure that can be installed on a power transmission line conductor.

3. A CT power supply device with constant voltage and current limiting charging function according to claim 1, characterized in that: The CT power taking coil adopts an open type CT power taking coil.

4. A CT power supply device with constant voltage and current limiting charging function according to claim 1, characterized in that: The first thyristor TR1 adopts MAC97A6; the second thyristor TR2 adopts BTA16-600B.

5. A method for collecting electricity from a CT power collection device with a constant voltage and current limiting charging function, characterized in that: The power taking method is implemented by using a CT power taking device with constant voltage and current limiting charging function according to any one of claims 1 to 4, comprising the following steps: Step S1: Install the device on the wire with power on to obtain energy from the wire; Step S2: The CT power taking module converts the primary current on the wire into a secondary current; Step S3: The rectifier circuit adjusts the secondary current and supplies power to the load through output control, while the excess energy is charged to the battery through the constant voltage and current limiting charging module.

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